Memory Leak

[Emily Fong]

Hi,

We have a window application which developing with RadForm and all the radcontrol (Q2 2011 version).  We found that after we close each form, the memory usage in client machine does not release.  We used the JustTrace tool / Net Performance Tool and found that some of the Telerik control was disposed but not in GC.

We created a testing application to compare the memory usage for RadForm and Window Form.  In the testing application, we have one Window Forms with menu control, one RadForm with RadGridView and one Window Form with RadGridView.  When we run the application, we keep open and close the RadForm 10 times.  Then, we found the memory usage is increase around 5,000k.  However, if we do the same on Window Form, the memory usage is only increase 500k.

So, how can we release the memory after we close the forms ( before the application was not closed)?

Code for the Window Form with menu control:

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.RadContextMenuManager1 = New Telerik.WinControls.UI.RadContextMenuManager()
        Me.MainMenu = New Telerik.WinControls.UI.RadMenu()
        Me.menuFavorites = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuCode = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuMaster = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuPrice = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuPO = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuSO = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuInventory = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuInvoice = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuEnquiry = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuAccount = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuMobile = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuWindow = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuHelp = New Telerik.WinControls.UI.RadMenuItem()
        Me.menuTheme = New Telerik.WinControls.UI.RadMenuItem()
        CType(Me.MainMenu, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'MainMenu
        '
        Me.MainMenu.CausesValidation = False
        Me.MainMenu.Font = New System.Drawing.Font("Verdana", 9.0!)
        Me.MainMenu.Items.AddRange(New Telerik.WinControls.RadItem() {Me.menuFavorites, Me.menuCode, Me.menuMaster, Me.menuPrice, Me.menuPO, Me.menuSO, Me.menuInventory, Me.menuInvoice, Me.menuEnquiry, Me.menuAccount, Me.menuMobile, Me.menuWindow, Me.menuHelp, Me.menuTheme})
        Me.MainMenu.Location = New System.Drawing.Point(0, 0)
        Me.MainMenu.Name = "MainMenu"
        '
        '
        '
        Me.MainMenu.RootElement.AccessibleDescription = Nothing
        Me.MainMenu.RootElement.AccessibleName = Nothing
        Me.MainMenu.RootElement.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.MainMenu.RootElement.AngleTransform = 0.0!
        Me.MainMenu.RootElement.FlipText = False
        Me.MainMenu.RootElement.Margin = New System.Windows.Forms.Padding(0)
        Me.MainMenu.RootElement.Padding = New System.Windows.Forms.Padding(0)
        Me.MainMenu.RootElement.Text = Nothing
        Me.MainMenu.RootElement.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.MainMenu.Size = New System.Drawing.Size(752, 38)
        Me.MainMenu.TabIndex = 7
        '
        'menuFavorites
        '
        Me.menuFavorites.AccessibleDescription = "&Favorites"
        Me.menuFavorites.AccessibleName = "&Favorites"
        Me.menuFavorites.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuFavorites.AngleTransform = 0.0!
        Me.menuFavorites.AutoSizeMode = Telerik.WinControls.RadAutoSizeMode.WrapAroundChildren
        Me.menuFavorites.Class = ""
        Me.menuFavorites.FlipText = False
        Me.menuFavorites.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuFavorites.ForeColor = System.Drawing.SystemColors.ControlText
        Me.menuFavorites.Image = Nothing
        Me.menuFavorites.ImageIndex = -1
        Me.menuFavorites.ImageKey = ""
        Me.menuFavorites.Margin = New System.Windows.Forms.Padding(0)
        Me.menuFavorites.Name = "menuFavorites"
        Me.menuFavorites.Padding = New System.Windows.Forms.Padding(0)
        Me.menuFavorites.RightToLeft = False
        Me.menuFavorites.Tag = ""
        Me.menuFavorites.Text = "&Favorites"
        Me.menuFavorites.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuFavorites.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuFavorites.Visibility = Telerik.WinControls.ElementVisibility.Visible
        '
        'menuCode
        '
        Me.menuCode.AccessibleDescription = "&Code"
        Me.menuCode.AccessibleName = "&Code"
        Me.menuCode.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuCode.AngleTransform = 0.0!
        Me.menuCode.AutoSizeMode = Telerik.WinControls.RadAutoSizeMode.WrapAroundChildren
        Me.menuCode.Class = ""
        Me.menuCode.DescriptionFont = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuCode.FlipText = False
        Me.menuCode.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuCode.Image = Nothing
        Me.menuCode.ImageIndex = -1
        Me.menuCode.ImageKey = ""
        Me.menuCode.Margin = New System.Windows.Forms.Padding(0)
        Me.menuCode.Name = "menuCode"
        Me.menuCode.Padding = New System.Windows.Forms.Padding(0)
        Me.menuCode.RightToLeft = False
        Me.menuCode.ShowArrow = False
        Me.menuCode.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuCode.Text = "&Code"
        Me.menuCode.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuCode.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuCode.Visibility = Telerik.WinControls.ElementVisibility.Visible
        '
        'menuMaster
        '
        Me.menuMaster.AccessibleDescription = "&Master"
        Me.menuMaster.AccessibleName = "&Master"
        Me.menuMaster.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuMaster.AngleTransform = 0.0!
        Me.menuMaster.AutoSizeMode = Telerik.WinControls.RadAutoSizeMode.WrapAroundChildren
        Me.menuMaster.Class = ""
        Me.menuMaster.DescriptionFont = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuMaster.FlipText = False
        Me.menuMaster.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuMaster.Image = Nothing
        Me.menuMaster.ImageIndex = -1
        Me.menuMaster.ImageKey = ""
        Me.menuMaster.Margin = New System.Windows.Forms.Padding(0)
        Me.menuMaster.Name = "menuMaster"
        Me.menuMaster.Padding = New System.Windows.Forms.Padding(0)
        Me.menuMaster.RightToLeft = False
        Me.menuMaster.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuMaster.Text = "&Master"
        Me.menuMaster.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuMaster.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuMaster.Visibility = Telerik.WinControls.ElementVisibility.Visible
        '
        'menuPrice
        '
        Me.menuPrice.AccessibleDescription = "&Price && Promotion"
        Me.menuPrice.AccessibleName = "&Price && Promotion"
        Me.menuPrice.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuPrice.AngleTransform = 0.0!
        Me.menuPrice.AutoSizeMode = Telerik.WinControls.RadAutoSizeMode.WrapAroundChildren
        Me.menuPrice.Class = ""
        Me.menuPrice.DescriptionFont = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuPrice.FlipText = False
        Me.menuPrice.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuPrice.Image = Nothing
        Me.menuPrice.ImageIndex = -1
        Me.menuPrice.ImageKey = ""
        Me.menuPrice.Margin = New System.Windows.Forms.Padding(0)
        Me.menuPrice.Name = "menuPrice"
        Me.menuPrice.Padding = New System.Windows.Forms.Padding(0)
        Me.menuPrice.RightToLeft = False
        Me.menuPrice.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuPrice.Text = "&Price && Promotion"
        Me.menuPrice.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuPrice.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuPrice.Visibility = Telerik.WinControls.ElementVisibility.Collapsed
        '
        'menuPO
        '
        Me.menuPO.AccessibleDescription = "&Purchase Order"
        Me.menuPO.AccessibleName = "&Purchase Order"
        Me.menuPO.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuPO.AngleTransform = 0.0!
        Me.menuPO.Class = ""
        Me.menuPO.DescriptionFont = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuPO.FlipText = False
        Me.menuPO.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuPO.Image = Nothing
        Me.menuPO.ImageIndex = -1
        Me.menuPO.ImageKey = ""
        Me.menuPO.Margin = New System.Windows.Forms.Padding(0)
        Me.menuPO.Name = "menuPO"
        Me.menuPO.Padding = New System.Windows.Forms.Padding(0)
        Me.menuPO.RightToLeft = False
        Me.menuPO.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuPO.Text = "&Purchase Order"
        Me.menuPO.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuPO.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuPO.Visibility = Telerik.WinControls.ElementVisibility.Collapsed
        '
        'menuSO
        '
        Me.menuSO.AccessibleDescription = "&Sales Order"
        Me.menuSO.AccessibleName = "&Sales Order"
        Me.menuSO.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuSO.AngleTransform = 0.0!
        Me.menuSO.Class = ""
        Me.menuSO.DescriptionFont = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuSO.FlipText = False
        Me.menuSO.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuSO.Image = Nothing
        Me.menuSO.ImageIndex = -1
        Me.menuSO.ImageKey = ""
        Me.menuSO.Margin = New System.Windows.Forms.Padding(0)
        Me.menuSO.Name = "menuSO"
        Me.menuSO.Padding = New System.Windows.Forms.Padding(0)
        Me.menuSO.RightToLeft = False
        Me.menuSO.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuSO.Text = "&Sales Order"
        Me.menuSO.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuSO.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuSO.Visibility = Telerik.WinControls.ElementVisibility.Collapsed
        '
        'menuInventory
        '
        Me.menuInventory.AccessibleDescription = "&Inventory"
        Me.menuInventory.AccessibleName = "&Inventory"
        Me.menuInventory.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuInventory.AngleTransform = 0.0!
        Me.menuInventory.Class = ""
        Me.menuInventory.DescriptionFont = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuInventory.FlipText = False
        Me.menuInventory.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuInventory.Image = Nothing
        Me.menuInventory.ImageIndex = -1
        Me.menuInventory.ImageKey = ""
        Me.menuInventory.Margin = New System.Windows.Forms.Padding(0)
        Me.menuInventory.Name = "menuInventory"
        Me.menuInventory.Padding = New System.Windows.Forms.Padding(0)
        Me.menuInventory.RightToLeft = False
        Me.menuInventory.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuInventory.Text = "&Inventory"
        Me.menuInventory.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuInventory.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuInventory.Visibility = Telerik.WinControls.ElementVisibility.Collapsed
        '
        'menuInvoice
        '
        Me.menuInvoice.AccessibleDescription = "&Invoice"
        Me.menuInvoice.AccessibleName = "&Invoice"
        Me.menuInvoice.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuInvoice.AngleTransform = 0.0!
        Me.menuInvoice.Class = ""
        Me.menuInvoice.DescriptionFont = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuInvoice.FlipText = False
        Me.menuInvoice.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuInvoice.Image = Nothing
        Me.menuInvoice.ImageIndex = -1
        Me.menuInvoice.ImageKey = ""
        Me.menuInvoice.Margin = New System.Windows.Forms.Padding(0)
        Me.menuInvoice.Name = "menuInvoice"
        Me.menuInvoice.Padding = New System.Windows.Forms.Padding(0)
        Me.menuInvoice.RightToLeft = False
        Me.menuInvoice.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuInvoice.Text = "&Invoice"
        Me.menuInvoice.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuInvoice.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuInvoice.Visibility = Telerik.WinControls.ElementVisibility.Collapsed
        '
        'menuEnquiry
        '
        Me.menuEnquiry.AccessibleDescription = "&Enquiry"
        Me.menuEnquiry.AccessibleName = "&Enquiry"
        Me.menuEnquiry.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuEnquiry.AngleTransform = 0.0!
        Me.menuEnquiry.AutoSizeMode = Telerik.WinControls.RadAutoSizeMode.WrapAroundChildren
        Me.menuEnquiry.Class = ""
        Me.menuEnquiry.DescriptionFont = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuEnquiry.FlipText = False
        Me.menuEnquiry.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuEnquiry.Image = Nothing
        Me.menuEnquiry.ImageIndex = -1
        Me.menuEnquiry.ImageKey = ""
        Me.menuEnquiry.Margin = New System.Windows.Forms.Padding(0)
        Me.menuEnquiry.Name = "menuEnquiry"
        Me.menuEnquiry.Padding = New System.Windows.Forms.Padding(0)
        Me.menuEnquiry.RightToLeft = False
        Me.menuEnquiry.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuEnquiry.Text = "&Enquiry"
        Me.menuEnquiry.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuEnquiry.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuEnquiry.Visibility = Telerik.WinControls.ElementVisibility.Collapsed
        '
        'menuAccount
        '
        Me.menuAccount.AccessibleDescription = "Account"
        Me.menuAccount.AccessibleName = "Account"
        Me.menuAccount.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuAccount.AngleTransform = 0.0!
        Me.menuAccount.AutoSizeMode = Telerik.WinControls.RadAutoSizeMode.WrapAroundChildren
        Me.menuAccount.Class = ""
        Me.menuAccount.DescriptionFont = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuAccount.FlipText = False
        Me.menuAccount.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuAccount.Image = Nothing
        Me.menuAccount.ImageIndex = -1
        Me.menuAccount.ImageKey = ""
        Me.menuAccount.Margin = New System.Windows.Forms.Padding(0)
        Me.menuAccount.MaxSize = New System.Drawing.Size(0, 0)
        Me.menuAccount.Name = "menuAccount"
        Me.menuAccount.Padding = New System.Windows.Forms.Padding(0)
        Me.menuAccount.RightToLeft = False
        Me.menuAccount.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuAccount.Text = "Account"
        Me.menuAccount.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuAccount.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuAccount.Visibility = Telerik.WinControls.ElementVisibility.Collapsed
        '
        'menuMobile
        '
        Me.menuMobile.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuMobile.AngleTransform = 0.0!
        Me.menuMobile.Class = ""
        Me.menuMobile.FlipText = False
        Me.menuMobile.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuMobile.Image = Nothing
        Me.menuMobile.ImageIndex = -1
        Me.menuMobile.ImageKey = ""
        Me.menuMobile.Margin = New System.Windows.Forms.Padding(0)
        Me.menuMobile.Name = "menuMobile"
        Me.menuMobile.Padding = New System.Windows.Forms.Padding(0)
        Me.menuMobile.RightToLeft = False
        Me.menuMobile.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuMobile.Text = ""
        Me.menuMobile.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuMobile.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuMobile.Visibility = Telerik.WinControls.ElementVisibility.Collapsed
        '
        'menuWindow
        '
        Me.menuWindow.AccessibleDescription = "Windows"
        Me.menuWindow.AccessibleName = "Windows"
        Me.menuWindow.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuWindow.AngleTransform = 0.0!
        Me.menuWindow.Class = ""
        Me.menuWindow.FitToSizeMode = Telerik.WinControls.RadFitToSizeMode.FitToParentContent
        Me.menuWindow.FlipText = False
        Me.menuWindow.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuWindow.Image = Nothing
        Me.menuWindow.ImageIndex = -1
        Me.menuWindow.ImageKey = ""
        Me.menuWindow.Margin = New System.Windows.Forms.Padding(0)
        Me.menuWindow.MdiList = True
        Me.menuWindow.Name = "menuWindow"
        Me.menuWindow.Padding = New System.Windows.Forms.Padding(0)
        Me.menuWindow.RightToLeft = False
        Me.menuWindow.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuWindow.Tag = "視窗"
        Me.menuWindow.Text = "Windows"
        Me.menuWindow.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuWindow.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuWindow.Visibility = Telerik.WinControls.ElementVisibility.Visible
        '
        'menuHelp
        '
        Me.menuHelp.AccessibleDescription = "&Help"
        Me.menuHelp.AccessibleName = "&Help"
        Me.menuHelp.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuHelp.AngleTransform = 0.0!
        Me.menuHelp.Class = ""
        Me.menuHelp.FlipText = False
        Me.menuHelp.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuHelp.Image = Nothing
        Me.menuHelp.ImageIndex = -1
        Me.menuHelp.ImageKey = ""
        Me.menuHelp.Margin = New System.Windows.Forms.Padding(0)
        Me.menuHelp.Name = "menuHelp"
        Me.menuHelp.Padding = New System.Windows.Forms.Padding(0)
        Me.menuHelp.RightToLeft = False
        Me.menuHelp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuHelp.Text = "&Help"
        Me.menuHelp.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuHelp.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuHelp.Visibility = Telerik.WinControls.ElementVisibility.Hidden
        '
        'menuTheme
        '
        Me.menuTheme.AccessibleDescription = "Theme"
        Me.menuTheme.AccessibleName = "Theme"
        Me.menuTheme.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.menuTheme.AngleTransform = 0.0!
        Me.menuTheme.Class = ""
        Me.menuTheme.Enabled = False
        Me.menuTheme.FlipText = False
        Me.menuTheme.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.menuTheme.Image = Nothing
        Me.menuTheme.ImageIndex = -1
        Me.menuTheme.ImageKey = ""
        Me.menuTheme.Margin = New System.Windows.Forms.Padding(0)
        Me.menuTheme.Name = "menuTheme"
        Me.menuTheme.Padding = New System.Windows.Forms.Padding(0)
        Me.menuTheme.RightToLeft = False
        Me.menuTheme.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
        Me.menuTheme.Text = "Theme"
        Me.menuTheme.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter
        Me.menuTheme.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.menuTheme.Visibility = Telerik.WinControls.ElementVisibility.Hidden
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(752, 338)
        Me.Controls.Add(Me.MainMenu)
        Me.IsMdiContainer = True
        Me.Name = "Form1"
        Me.Text = "Form1"
        CType(Me.MainMenu, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub
    Friend WithEvents RadContextMenuManager1 As Telerik.WinControls.UI.RadContextMenuManager
    Friend WithEvents MainMenu As Telerik.WinControls.UI.RadMenu
    Friend WithEvents menuFavorites As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuCode As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuMaster As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuPrice As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuPO As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuSO As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuInventory As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuInvoice As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuEnquiry As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuAccount As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuMobile As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuWindow As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuHelp As Telerik.WinControls.UI.RadMenuItem
    Friend WithEvents menuTheme As Telerik.WinControls.UI.RadMenuItem

End Class

vb code:

Public Class Form1
    Private WithEvents frmRad As RadForm1
    Private WithEvents frmForm As Form2

    Private Sub menuCode_Click(sender As System.Object, e As System.EventArgs) Handles menuCode.Click
        frmRad = New RadForm1
        frmRad.Show()
    End Sub

    Private Sub menuMaster_Click(sender As System.Object, e As System.EventArgs) Handles menuMaster.Click
        frmForm = New Form2
        frmForm.Show()
    End Sub

    Private Sub frmForm_FormClosed(sender As Object, e As System.Windows.Forms.FormClosedEventArgs) Handles frmForm.FormClosed
        frmForm = Nothing
    End Sub

    Private Sub frmRad_FormClosed(sender As Object, e As System.Windows.Forms.FormClosedEventArgs) Handles frmRad.FormClosed
        frmRad = Nothing
    End Sub
End Class

RadForm:

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class RadForm1
    Inherits Telerik.WinControls.UI.RadForm

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.RadGridView1 = New Telerik.WinControls.UI.RadGridView()
        CType(Me.RadGridView1, System.ComponentModel.ISupportInitialize).BeginInit()
        CType(Me, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'RadGridView1
        '
        Me.RadGridView1.Location = New System.Drawing.Point(32, 23)
        Me.RadGridView1.Name = "RadGridView1"
        Me.RadGridView1.Size = New System.Drawing.Size(240, 150)
        Me.RadGridView1.TabIndex = 1
        Me.RadGridView1.Text = "RadGridView1"
        '
        'RadForm1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(308, 292)
        Me.Controls.Add(Me.RadGridView1)
        Me.Name = "RadForm1"
        '
        '
        '
        Me.RootElement.ApplyShapeToControl = True
        Me.Text = "RadForm1"
        CType(Me.RadGridView1, System.ComponentModel.ISupportInitialize).EndInit()
        CType(Me, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents RadGridView1 As Telerik.WinControls.UI.RadGridView
End Class

Window Form with RadGridView:

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form2
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.RadGridView1 = New Telerik.WinControls.UI.RadGridView()
        CType(Me.RadGridView1, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'RadGridView1
        '
        Me.RadGridView1.Location = New System.Drawing.Point(12, 12)
        Me.RadGridView1.Name = "RadGridView1"
        Me.RadGridView1.Size = New System.Drawing.Size(240, 150)
        Me.RadGridView1.TabIndex = 0
        Me.RadGridView1.Text = "RadGridView1"
        '
        'Form2
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(284, 262)
        Me.Controls.Add(Me.RadGridView1)
        Me.Name = "Form2"
        Me.Text = "Form2"
        CType(Me.RadGridView1, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents RadGridView1 As Telerik.WinControls.UI.RadGridView
End Class

Best Regards,
Emily

[Peter]

Hi Emily, 

Thank you for writing.

I want to share with you that RadForm/Form is a disposable object and you have to call its Dispose method explicitly, for example:

using(Form2 newform = newForm2())

{

   newform.ShowDialog();

}

I also want to share with you that the Garbage Collector releases the instance of RadControls later than it frees less complex controls. The reason is that RadControls is a second generation Garbage Collector object. If you want to release the memory instantly after the form is closed, you should call the GC.Collect method manually. Consider the code snippet below: 

myForm.Close();
myForm.Dispose();
GC.Collect();

GC.WaitForFullGCApproach();

GC.WaitForFullGCComplete();

GC.WaitForPendingFinalizers();

GC.Collect();

More information on garbage collection generations can be found here.

In addition, our themes create static objects that remain active in memory until the application is closed. This can raise the application memory with several megabytes.

If you continue to experience issues, please send us your project and we will investigate further.
I am looking forward to your reply.

Kind regards,
Peter
the Telerik team

SP1 of Q3’11 of RadControls for WinForms is available for download (see what's new).

[Emily Fong]

Thanks!

However, we found any memory leaks problem. Please help to handle it.
In a Radform, we have a RadGridView with datetimecolumn.  We click the calendar in grid column to select a date and close the form.  Then, in .NET Memory Profiler, we found that there is a RadCalendar control is directly rooted by an EventHandler and that Eventhandler has not been properly removed.
So, how can we remove that EventHandler since that RadCalendar is created by RadGridView control?

The following are our sample coding:
MdiForm:

Public Class Form1
    Private WithEvents radform As RadForm1

    Private Sub RadMenuItem1_Click(sender As Object, e As System.EventArgs) Handles RadMenuItem1.Click
        radform = New RadForm1
        radform.MdiParent = Me
        radform.Top = 0
        radform.Left = 0
        radform.Show()
    End Sub

    Private Sub radform_FormClosed(sender As Object, e As System.Windows.Forms.FormClosedEventArgs) Handles radform.FormClosed
        radform.Dispose()
        radform = Nothing
        GC.Collect()
        GC.WaitForFullGCApproach()
        GC.WaitForFullGCComplete()
        GC.WaitForPendingFinalizers()
        GC.Collect()

    End Sub
End Class

ChildForm (with GridView):

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class RadForm1
    Inherits Telerik.WinControls.UI.RadForm

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Dim GridViewDateTimeColumn1 As Telerik.WinControls.UI.GridViewDateTimeColumn = New Telerik.WinControls.UI.GridViewDateTimeColumn()
        Me.rgvEnquiry = New Telerik.WinControls.UI.RadGridView()
        CType(Me.rgvEnquiry, System.ComponentModel.ISupportInitialize).BeginInit()
        CType(Me, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'rgvEnquiry
        '
        Me.rgvEnquiry.BackColor = System.Drawing.Color.FromArgb(CType(CType(191, Byte), Integer), CType(CType(219, Byte), Integer), CType(CType(255, Byte), Integer))
        Me.rgvEnquiry.Cursor = System.Windows.Forms.Cursors.Default
        Me.rgvEnquiry.Dock = System.Windows.Forms.DockStyle.Fill
        Me.rgvEnquiry.Font = New System.Drawing.Font("Verdana", 9.0!)
        Me.rgvEnquiry.ForeColor = System.Drawing.Color.Black
        Me.rgvEnquiry.ImeMode = System.Windows.Forms.ImeMode.NoControl
        Me.rgvEnquiry.Location = New System.Drawing.Point(0, 0)
        '
        'rgvEnquiry
        '
        Me.rgvEnquiry.MasterTemplate.AllowColumnChooser = False
        Me.rgvEnquiry.MasterTemplate.AllowDeleteRow = False
        Me.rgvEnquiry.MasterTemplate.AutoExpandGroups = True
        GridViewDateTimeColumn1.HeaderText = "column1"
        GridViewDateTimeColumn1.Name = "column1"
        GridViewDateTimeColumn1.Width = 140
        Me.rgvEnquiry.MasterTemplate.Columns.AddRange(New Telerik.WinControls.UI.GridViewDataColumn() {GridViewDateTimeColumn1})
        Me.rgvEnquiry.MasterTemplate.EnableAlternatingRowColor = True
        Me.rgvEnquiry.MasterTemplate.EnableFiltering = True
        Me.rgvEnquiry.MasterTemplate.ShowChildViewCaptions = True
        Me.rgvEnquiry.MasterTemplate.ShowGroupedColumns = True
        Me.rgvEnquiry.MasterTemplate.ShowParentGroupSummaries = True
        Me.rgvEnquiry.Name = "rgvEnquiry"
        Me.rgvEnquiry.ReadOnly = True
        Me.rgvEnquiry.RightToLeft = System.Windows.Forms.RightToLeft.No
        '
        '
        '
        Me.rgvEnquiry.RootElement.AccessibleDescription = Nothing
        Me.rgvEnquiry.RootElement.AccessibleName = Nothing
        Me.rgvEnquiry.RootElement.Alignment = System.Drawing.ContentAlignment.TopLeft
        Me.rgvEnquiry.RootElement.AngleTransform = 0.0!
        Me.rgvEnquiry.RootElement.FlipText = False
        Me.rgvEnquiry.RootElement.ForeColor = System.Drawing.Color.Black
        Me.rgvEnquiry.RootElement.Margin = New System.Windows.Forms.Padding(0)
        Me.rgvEnquiry.RootElement.Padding = New System.Windows.Forms.Padding(0)
        Me.rgvEnquiry.RootElement.Text = Nothing
        Me.rgvEnquiry.RootElement.TextOrientation = System.Windows.Forms.Orientation.Horizontal
        Me.rgvEnquiry.ShowChildViewCaptions = True
        Me.rgvEnquiry.Size = New System.Drawing.Size(798, 441)
        Me.rgvEnquiry.TabIndex = 5
        '
        'RadForm1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(798, 441)
        Me.Controls.Add(Me.rgvEnquiry)
        Me.Name = "RadForm1"
        '
        '
        '
        Me.RootElement.ApplyShapeToControl = True
        Me.Text = "RadForm1"
        CType(Me.rgvEnquiry, System.ComponentModel.ISupportInitialize).EndInit()
        CType(Me, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents rgvEnquiry As Telerik.WinControls.UI.RadGridView
End Class

Emily

[Emily Fong]

Is there any advise?

[Peter]

Hi Emily,

Thank you for writing back and for the provided details.

Despite our efforts, our tests did not show memory leaks in a similar scenario and I was not able to identify a memory leak in our test application. Therefore, could you please provide me with your application and exact steps to reproduce the issue in it, so that we can locate it and address it further?

Thank you for your time and cooperation. Please note that you have to open a new support ticket in order to be able to attach files.

All the best,
Peter
the Telerik team