How update a specific range of cells o one column?

[Fernando]

I have a RadGridView and with one button I command that everything in the column seven change of update to 5 and nothing happens, the value is not updated, I have tried many ways to solve this but I could not. I read this :
Before the value is set RadGridView.Validating event is fired. This event could be canceled to prevent updating the value in the cell. After the value update RadGridView.Validated event is fired.

My question is how cancel de event Validating?
I need Refresh the RadGridView to see the updates?

[Richard Slade]

Hello Fernando,

Hope you're well. I am not quite sure I understand what you wish to do. I think you are trying to update all cells in a column where they are equal to a value to be a new value from a button click. Is that correct?

If so, this small example shows updating a column, and substitutes one value for another.

Private Sub RadButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadButton1.Click
    Using Me.RadGridView1.DeferRefresh()
        For Each row As GridViewRowInfo In Me.RadGridView1.Rows
            If row.Cells("ColumnName").Value IsNot Nothing Then
                If row.Cells("ColumnName").Value.ToString() = "SomeValue" Then
                    row.Cells("ColumnName").Value = "NewValue"
                End If
            End If
        Next
    End Using
End Sub

If this isn't whart you mean, please explain further and I'll be happy to help.
thanks
Richard

[Fernando]

that code is exactly what I already had, the only thing different is Using Me.RadGridView1.DeferRefresh() so I tried it and add it and the value remains unchanged, so add a message to the cycle that I return the value in cell after being modified and effectively is the value that was assigned in the table but still with the same value

Private Sub RadButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadButton1.Click

    Using Me.RadGridView1.DeferRefresh()

        For Each row As GridViewRowInfo In Me.RadGridView1.Rows

            If row.Cells("ColumnName").Value IsNot Nothing Then

                If row.Cells("ColumnName").Value.ToString() = "SomeValue" Then

                    row.Cells("ColumnName").Value = "NewValue"
                     MsgBox(row.Cells("ColumnName").Value) 'I add this line and the value chance but in the RadGridView not.

                End If

            End If

        Next

    End Using

End Sub

I do not understand why but it did not work.

[Richard Slade]

Hello Fernando,

Please can you try this simple sample and let me know how it goes for you. It's just a RadGridView and a RadButton on a form

Imports Telerik.WinControls
Imports Telerik.WinControls.UI


Public Class Form1



    Private Sub Form1_Load(ByVal sender As System.Object,
                           ByVal e As System.EventArgs) Handles MyBase.Load


        ' Make a data source for the grid
        Dim list As New List(Of person)
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Weymouth"))
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Weymouth"))
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Weymouth"))
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Weymouth"))
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Weymouth"))
        ' assign the data source of the grid
        Me.RadGridView1.DataSource = list


    End Sub

    Private Sub RadButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadButton1.Click
        Using Me.RadGridView1.DeferRefresh()
            For Each row As GridViewRowInfo In Me.RadGridView1.Rows
                If row.Cells("Name").Value IsNot Nothing Then
                    If row.Cells("Name").Value.ToString() = "Richard" Then
                        row.Cells("Name").Value = "Fernando"
                    End If
                End If
            Next
        End Using
    End Sub

End Class

Public Class person
    Private m_Customer_Id As Integer
    Private m_Name As String
    Private m_City As String

    Public Sub New()
    End Sub

    Public Sub New(ByVal name As String, ByVal id As Integer, ByVal city As String)
        m_Name = name
        m_Customer_Id = id
        m_City = city
    End Sub

    Public Property City() As String
        Get
            Return m_City
        End Get
        Set(ByVal value As String)
            m_City = value
        End Set
    End Property

    Public Property Name() As String
        Get
            Return m_Name
        End Get
        Set(ByVal value As String)
            m_Name = value
        End Set
    End Property

    Public Property Id() As Integer
        Get
            Return m_Customer_Id
        End Get
        Set(ByVal value As Integer)
            m_Customer_Id = value
        End Set
    End Property

    Public Property HasBeard() As Integer
        Get
            Return m_Customer_Id
        End Get
        Set(ByVal value As Integer)
            m_Customer_Id = value
        End Set
    End Property

End Class

thanks
Richard

[Richard Slade]

Note: Some of the properties above were not needed, but I haven't removed them in order to give you this sample quickly.
Thanks
Richard

[Richard Slade]

There. This one is just the same, but with those things that are not needed, removed.

Imports Telerik.WinControls
Imports Telerik.WinControls.UI

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object,
                           ByVal e As System.EventArgs) Handles MyBase.Load


        ' Make a data source for the grid
        Dim list As New List(Of person)
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Christcurch"))
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Christcurch"))
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Christcurch"))
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Christcurch"))
        list.Add(New person("Richard", 1, "New Milton"))
        list.Add(New person("Bob", 2, "London"))
        list.Add(New person("Stewart", 3, "Bournemouth"))
        list.Add(New person("Chris", 4, "Southampton"))
        list.Add(New person("Leisl", 1, "Christcurch"))
        list.Add(New person("Tom", 5, "Weymouth"))
        list.Add(New person("Oly", 6, "Christcurch"))
        ' assign the data source of the grid
        Me.RadGridView1.DataSource = list

    End Sub

    Private Sub RadButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadButton1.Click
        Using Me.RadGridView1.DeferRefresh()
            For Each row As GridViewRowInfo In Me.RadGridView1.Rows
                If row.Cells("Name").Value IsNot Nothing Then
                    If row.Cells("Name").Value.ToString() = "Richard" Then
                        row.Cells("Name").Value = "Fernando"
                    End If
                End If

            Next
        End Using
    End Sub

End Class


Public Class person
    Private m_Customer_Id As Integer
    Private m_Name As String
    Private m_City As String

    Public Sub New()
    End Sub

    Public Sub New(ByVal name As String, ByVal id As Integer, ByVal city As String)
        m_Name = name
        m_Customer_Id = id
        m_City = city
    End Sub

    Public Property City() As String
        Get
            Return m_City
        End Get
        Set(ByVal value As String)
            m_City = value
        End Set
    End Property

    Public Property Name() As String
        Get
            Return m_Name
        End Get
        Set(ByVal value As String)
            m_Name = value
        End Set
    End Property

End Class

[Fernando]

i delete the RadGridView and put again in my Form and Work perfect!
thanks the first post is the correct!

[Richard Slade]

Glad this is now working for you.
Richard