Questions on UI for WinForms Forum

3 answers

37 views

Hi there,

I have written a component that resides within a column of a RadGridView. Based on the provided source code, I need the cell events like CellBeginEdit, CellEndEdit, and CellValueChanged in the RadGridView to be handled intelligently and reliably for columns of the AdvancedRadMultiColumnComboPlus type.

In other words, how can I get events like CellBeginEdit, CellEndEdit, and CellValueChanged to fire for columns of the AdvancedRadMultiColumnComboPlus type?

Please guide me.

Thank you.

GridView

answered on 22 Aug 2025

0 answers

24 views

Missing data in RadGridView

I'm experiencing a bizarre issue with RadGridView.

I had a grid on a form that displays the results of a List collection. Pretty simple, but there was one column that refused to display the data. The column itself appeared but the data didn't display. I moved everything to another form and it worked fine.

Now I added another column to the grid and now that won't display data. The data is in the list collection, the FieldName property is correct (I even copied it from the POCO to make sure.). Then I added another column to the grid and it won't display at all at runtime even though it shows in the designer. Here is the code from the designer:

Any ideas on this one. I've never had a grid act like this before. Unfortunately I can't send you demo code s if I copy it to another form it will work.

Carl

gvMemos.MasterTemplate.AllowAddNewRow = false;
gvMemos.MasterTemplate.AllowColumnHeaderContextMenu = false;
gvMemos.MasterTemplate.AllowDeleteRow = false;
gvMemos.MasterTemplate.AllowEditRow = false;
gvMemos.MasterTemplate.AllowRowHeaderContextMenu = false;
gvMemos.MasterTemplate.AllowRowResize = false;
gvMemos.MasterTemplate.AllowSearchRow = true;
gvMemos.MasterTemplate.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;
gridViewTextBoxColumn1.EnableExpressionEditor = false;
gridViewTextBoxColumn1.FieldName = "MemoOptionsDescription";
gridViewTextBoxColumn1.HeaderText = "column1";
gridViewTextBoxColumn1.Name = "column1";
gridViewTextBoxColumn1.ReadOnly = true;
gridViewTextBoxColumn1.Width = 284;
gridViewTextBoxColumn2.DataType = typeof(DateTime);
gridViewTextBoxColumn2.EnableExpressionEditor = false;
gridViewTextBoxColumn2.FieldName = "DateTimeStamp";
gridViewTextBoxColumn2.HeaderText = "Date/Time";
gridViewTextBoxColumn2.Name = "Date";
gridViewTextBoxColumn2.Width = 284;
gridViewTextBoxColumn3.EnableExpressionEditor = false;
gridViewTextBoxColumn3.FieldName = "MemoText2";
gridViewTextBoxColumn3.HeaderText = "Memo Description";
gridViewTextBoxColumn3.Name = "Memo Description";
gridViewTextBoxColumn3.ReadOnly = true;
gridViewTextBoxColumn3.Width = 284;
gridViewTextBoxColumn4.EnableExpressionEditor = false;
gridViewTextBoxColumn4.FieldName = "AssignedTo";
gridViewTextBoxColumn4.HeaderText = "Assigned To";
gridViewTextBoxColumn4.Name = "Assigned To";
gridViewTextBoxColumn4.ReadOnly = true;
gridViewTextBoxColumn4.Width = 284;
gridViewTextBoxColumn5.FieldName = "MemoTypeDescription";
gridViewTextBoxColumn5.HeaderText = "Type";
gridViewTextBoxColumn5.Name = "Memo Type";
gridViewTextBoxColumn5.Width = 284;
gridViewTextBoxColumn6.EnableExpressionEditor = false;
gridViewTextBoxColumn6.FieldName = "MemoOptionsDescription";
gridViewTextBoxColumn6.HeaderText = "Options";
gridViewTextBoxColumn6.Name = "Options";
gridViewTextBoxColumn6.ReadOnly = true;
gridViewTextBoxColumn6.Width = 284;
gridViewTextBoxColumn7.EnableExpressionEditor = false;
gridViewTextBoxColumn7.FieldName = "OperID";
gridViewTextBoxColumn7.HeaderText = "User";
gridViewTextBoxColumn7.Name = "User";
gridViewTextBoxColumn7.ReadOnly = true;
gridViewTextBoxColumn7.Width = 282;
gvMemos.MasterTemplate.Columns.AddRange(new Telerik.WinControls.UI.GridViewDataColumn[] { gridViewTextBoxColumn1, gridViewTextBoxColumn2, gridViewTextBoxColumn3, gridViewTextBoxColumn4, gridViewTextBoxColumn5, gridViewTextBoxColumn6, gridViewTextBoxColumn7 });
gvMemos.MasterTemplate.EnableAlternatingRowColor = true;
gvMemos.MasterTemplate.EnablePaging = true;
gvMemos.MasterTemplate.ShowGroupedColumns = true;
gvMemos.MasterTemplate.ViewDefinition = tableViewDefinition1;
gvMemos.Name = "gvMemos";
gvMemos.Size = new System.Drawing.Size(1767, 229);
gvMemos.TabIndex = 4;
gvMemos.CellFormatting += OnCellFormattingMemos;
gvMemos.ViewCellFormatting += OnViewCellFormattingMemos;
gvMemos.ContextMenuOpening += OnContextMenuOpeningMemos;
gvMemos.DoubleClick += gvMemos_DoubleClick;

GridView

updated question on 21 Aug 2025

1 answer

27 views

Infinite loop when setting RadGridView.CurrentColumn in RadGridView.CurrentCellChanged event.

Hello!
I had a chance to notice some strange behavior with setting CurrentColumn.

For instance I would like to change focused column, in case someone tries to focus on the wrong column.

Let's review 2 cases:
Case #1 (without an issue):

1) User clicks on any cell (different from the current, for instance user cicked on column 2).
2) Grid tries to set Cell from column 2 as current.
3) RadGridView.CurrentCellChanged event is being triggered.
4) Method subscribed on RadGridView.CurrentCellChanged event sets CurrentColumn (for instance it sets 3 if Current one is not 3).
5) Grid sets Cell from third column as current.
6) Nothing is looped.

Case #2 (with issue):
1) Some Method from code sets CurrentColumn as 2 (different from the current one)
2) Grid tries to set Cell from column 2 as current
3) RadGridView.CurrentCellChanged event is being triggered.
4) Method subscribed on RadGridView.CurrentCellChanged event sets CurrentColumn (for instance it sets 3 if Current one is not 3).
5) Grid sets Cell from third column as current.
6) Loop has formed
6.1) Every RadGridView.CurrentCellChanged call it changes the input params:
call 1:
e.CurrentCell = (cell from column 2)
e.NewCell = (cell from column 3)
call 2:
e.CurrentCell = (cell from column 3)
e.NewCell = (cell from column 2)
call 3:
e.CurrentCell = (cell from column 2)
e.NewCell = (cell from column 3)
...

Code:

public partial class Form1 : Form
{
    private BindingSource bindingSource;
    public Form1()
    {
        InitializeComponent();
        InitializeGrid();

        radGridView1.CurrentCellChanged += RadGridView1_CurrentCellChanged;
    }

    private void RadGridView1_CurrentCellChanged(object sender, CurrentCellChangedEventArgs e)
    {
        if (radGridView1.CurrentColumn != radGridView1.Columns[2])
            radGridView1.CurrentColumn = radGridView1.Columns[2];
    }

    private void InitializeGrid()
    {
        bindingSource = new BindingSource();

        DataTable table = new DataTable();
        table.Columns.Add("Id", typeof(int));
        table.Columns.Add("Name", typeof(string));
        table.Columns.Add("Age", typeof(int));

        table.Rows.Add(1, "Alice", 30);
        table.Rows.Add(2, "Bob", 25);
        bindingSource.DataSource = table;
        radGridView1.DataSource = bindingSource;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        radGridView1.CurrentColumn = radGridView1.Columns[1];
    }
}

Telerik version: 2025.2.520.48

Is the any restriction of using CurrentCellChanged event?
Is there any other way we can provide such functionality?

Thank You!

GridView

answered on 19 Aug 2025

1 answer

15 views

using keys shift + F9

Hello,
I want to use the following commands:
F9 and Shift+F9.
F9: OK.
Shift+F9: no response?
Do you have a solution?

Here is my code.

METHOD PRIVATE VOID GridFamille_KeyDown( INPUT sender AS System.Object, INPUT e AS System.Windows.Forms.KeyEventArgs ):

IF e:Shift THEN DO:
CASE e:KEYCODE :
WHEN System.Windows.Forms.Keys:F9 THEN DO:
MESSAGE 'SHITF + F9' e:KEYCODE:ToString() VIEW-AS ALERT-BOX.
END.
END CASE.
END.
ELSE DO:
CASE e:KEYCODE:

WHEN System.Windows.Forms.Keys:F9 THEN DO:

MESSAGE 'F9' e:KEYCODE:ToString() VIEW-AS ALERT-BOX.

END.
END CASE.
END.

GridView

answered on 18 Aug 2025

2 answers

25 views

Datagridview - DrawString (Watermark)

Hello,

I want to add drawstring (watermark) to datagridview for some help information (for example: "double click to add new item" etc)

Can you help me?

GridView

updated answer on 11 Aug 2025

2 answers

22 views

Datagridview - Copy row

Hi,

in datagridview I have set AllowRowReorder to True and works well.

But I want to copy row (not move) when I hold Ctrl key, it is possible?

GridView

answered on 11 Aug 2025

1 answer

17 views

Radmap. Routing calculation with my own streets file

Hi,

I need to calculate the nearest route but using my own streets map. Is it possible?

Thank you!

Map

answered on 07 Aug 2025

1 answer

33 views

Deadlock when updating datasource of hierarchical GridView

Hi

I have a RadGridView with a object-relational 3-tier-hierarchy where the datasource is a DataSet.

In a situation where my application updates an item of the first sublayer of the dataset:

each.ItemArray = vorgang.ItemArray;

the whole application gets into a deadlock.

Here is the call stack:

 	Anwendung.dll!Xxx.Yyy.Anwendung.View.GermanRadGridLocalizationProvider.GetLocalizedString(string id) Line 843	C#
>	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GroupPanelElement.UpdateView()	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GroupPanelElement.ProcessEvent(Telerik.WinControls.UI.GridViewEvent eventData)	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(Telerik.WinControls.UI.GridViewEvent gridEvent, Telerik.WinControls.UI.PriorityWeakReferenceList list, Telerik.WinControls.UI.GridEventProcessMode processMode)	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessEvent(Telerik.WinControls.UI.GridViewEvent gridEvent)	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(Telerik.WinControls.UI.GridViewEvent gridEvent)	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(Telerik.WinControls.UI.GridViewEvent gridEvent)	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(Telerik.WinControls.UI.GridViewTemplate template, Telerik.WinControls.UI.GridViewEvent eventData, bool postUI)	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewObjectRelationalDataProvider.DispatchDataViewChangedEvent(Telerik.WinControls.UI.DataViewChangedEventArgs args)	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewObjectRelationalDataProvider.Refresh()	Unknown
 	Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewObjectRelationalDataProvider.bindableChildren_ListChanged(object sender, System.ComponentModel.ListChangedEventArgs e)	Unknown
 	System.Data.dll!System.Data.DataView.OnListChanged(System.ComponentModel.ListChangedEventArgs e)	Unknown
 	System.Data.dll!System.Data.DataView.IndexListChanged(object sender, System.ComponentModel.ListChangedEventArgs e)	Unknown
 	System.Data.dll!System.Data.DataView.IndexListChangedInternal(System.ComponentModel.ListChangedEventArgs e)	Unknown
 	System.Data.dll!System.Data.DataViewListener.IndexListChanged(System.ComponentModel.ListChangedEventArgs e)	Unknown
 	System.Data.dll!System.Data.Index.OnListChanged.AnonymousMethod__88_0(System.Data.DataViewListener listener, System.ComponentModel.ListChangedEventArgs args, bool arg2, bool arg3)	Unknown
 	System.Data.dll!System.Data.Listeners<System.__Canon>.Notify<System.__Canon, bool, bool>(System.__Canon arg1, bool arg2, bool arg3, System.Data.Listeners<System.__Canon>.Action<System.__Canon, System.__Canon, bool, bool> action)	Unknown
 	System.Data.dll!System.Data.Index.OnListChanged(System.ComponentModel.ListChangedEventArgs e)	Unknown
 	System.Data.dll!System.Data.Index.RecordStateChanged(int oldRecord, System.Data.DataViewRowState oldOldState, System.Data.DataViewRowState oldNewState, int newRecord, System.Data.DataViewRowState newOldState, System.Data.DataViewRowState newNewState)	Unknown
 	System.Data.dll!System.Data.DataTable.RecordStateChanged(int record1, System.Data.DataViewRowState oldState1, System.Data.DataViewRowState newState1, int record2, System.Data.DataViewRowState oldState2, System.Data.DataViewRowState newState2)	Unknown
 	System.Data.dll!System.Data.DataTable.SetNewRecordWorker(System.Data.DataRow row, int proposedRecord, System.Data.DataRowAction action, bool isInMerge, bool suppressEnsurePropertyChanged, int position, bool fireEvent, out System.Exception deferredException)	Unknown
 	System.Data.dll!System.Data.DataRow.EndEdit()	Unknown
 	System.Data.dll!System.Data.DataRow.ItemArray.set(object[] value)	Unknown

GridView

answered on 06 Aug 2025

1 answer

69 views

Licensing Issue

Good Evening All,

I have recently secured a new Teleik Developer License, and I have updated the controls to the latest version.

When I run my application from within Visual Studio 2022 i am getting an error message displayed across my forms as shown below.

I have clicked on the help button and followed all the steps on the following web link (https://docs.telerik.com/devtools/winforms/licensing/license-key). I have tried the automatic and the manual installation methods; however, the message is still showing. I have confirmed that the telerik-license.txt file has been downloaded as well.

Can you please assist with this so I can get the message removed?

Thank you in advanced.

Licensing

answered on 06 Aug 2025

1 answer

15 views

How does the CheckedDropDownList control use DescriptionTextListDataItems?

I introduced the function that the CheckedDropDownList control can use DescriptionTextListDataItems on https://www.telerik.com/products/winforms/checkeddropdownlist.aspx, but I didn't find any sample code. Only the DropDownList uses DescriptionTextListDataItems. How should the CheckedDropDownList control use DescriptionTextListDataItems?

CheckedDropDownList

answered on 06 Aug 2025