Questions on UI for WinForms Forum

1 answer

30 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

20 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

30 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

29 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

25 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

37 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

87 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

19 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

2 answers

40 views

Disable right-click menu in PdfViewer?

PdfViewer and PdfViewerNavigator

updated answer on 05 Aug 2025

1 answer

37 views

Implementing multiple filtering with RadCheckedDropDownList

I want to implement quick selection using the RadCheckedDropDownList control. When a user types content (assuming it's "adc" ,"1"or "app"), it should automatically filter to match the first record.

The data source is:
List<Model> datas = new List<Model>
{
new Model { Title = "Apple", Description = "abc1" },
new Model { Title = "Banana", Description = "ffd2" },
new Model { Title = "Cat", Description = "mmd3" },
new Model { Title = "Juice", Description = "nnr5" }
};

I have referred to https://docs.telerik.com/devtools/winforms/controls/dropdown-listcontrol-and-checkeddropdownlist/checkeddropdownlist/populating-with-data/data-binding, and also tried using Filter and FilterExpression, but neither can achieve multiple filtering. How can this be implemented?

AutoCompleteBox

CheckedDropDownList

answered on 04 Aug 2025