Last Updated: 27 May 2024 08:14 by ADMIN
EndEdit() method is not called of IEditableObject if an exception is thrown while setting a null value to the bound property
Last Updated: 15 May 2024 07:49 by ADMIN
Release 2024.2.514 (2024 Q2)
NullReferenceException occurs in a multi-select scenario when clicking (and holding the mouse button) on an empty area in the grid and the mouse leaves the boundaries of the control.
Last Updated: 15 May 2024 07:49 by ADMIN
Release 2024.2.514 (2024 Q2)

In this scenario, the RadGridView.DataSource property is set to Microsoft.EntityFrameworkCore.ChangeTracking.ObservableCollectionListSource. When the RadGridView.Rows.Remove() method is called an IndexOutOfRange exception is thrown.


Last Updated: 09 May 2024 10:25 by ADMIN
In this case, the RadGridView is in the Self-Reference hierarchy. When the value of a cell is changed runtime, we are populating the bound (BindingList) collection with new items. All BindingList notifications will be called, however, the internal RadListSource in the RadGridView won't be updated, thus leading to a ArgumentOutOfRangeException.
Last Updated: 08 May 2024 13:46 by ADMIN
In the description of the RowIndent property is mentioned that this will indent groups and hierarchy rows.  However, it can indent group rows only. 
Last Updated: 04 May 2024 08:38 by erwin
Holding CTRL + C on a cell for a couple of seconds will throw ExternalException. 
Last Updated: 01 May 2024 13:47 by ADMIN

In this scenario, the Browsable(false) attribute is set to both properties which are used to create the self-referencing hierarchy. When the columns are predefined, running that application will freeze as the RadGridView could not correctly get the parent row. If the columns are auto-generated, this behavior is not observed. 

This is not exactly a real solution as setting the Browsable(false) attribute will remove the properties from the source. However, the control should not freeze the application.

Last Updated: 25 Apr 2024 13:11 by Ashley
It appears that this scenario is not handled properly in our exporter. Consider the case where you have two templates that use view definition. 

The view definition from the second template is not exported at all.
Last Updated: 23 Apr 2024 12:12 by ADMIN
The Excel-like filter in the SelfReference hierarchy is slow.
Last Updated: 17 Apr 2024 14:45 by ADMIN
To reproduce:
- Add some rows to a grid.
- Sort the rows.
- Delete a row.
- The current row is not the next row.

Dim t As Test = RadGridView1.CurrentRow.DataBoundItem
Dim index As Integer = Me.RadGridView1.ChildRows.IndexOf(Me.RadGridView1.CurrentRow)
Me.RadGridView1.CurrentRow = Me.RadGridView1.ChildRows(index)
Last Updated: 17 Apr 2024 14:44 by ADMIN

Follow the steps:

1.Group by Description.

2. Expand the groups

3. Sort by Id

4. Try expanding the hierarchical level. You will notice that some of the rows disappear.

Please refer to the attached gif file illustrating the steps for replicating the issue.

Last Updated: 17 Apr 2024 14:43 by ADMIN


Please find attached sample project having 2 different reference folder(Telerik2018,Telerik2020) for Telerik.

Code flow & Issue description: I have Event "radGridView1_EditorRequired" in which i have attached another event on value changed "Editor_ValueChanged" in which we get data gron DropdownListElement using ((RadDropDownListElement)(sender)).SelectedValue.
Issue is when we use version (2018.3.1016.40) we get selected value text, in case of current version (2020.1.218.40) we get null value.

Current version DLL  2020.1.218.40 (Issue in current version)
Previous version DLL 2018.3.1016.40 (Working fine)

Note : I have also attached both version of Telerik DLL in sample project, you can reproduce issue by referencing to 2020.1.218.40 version. After selecting values as shown in attached screenshot you will get null value as shown in another screenshot.

Please find attached screenshot  for selecting values to reproduce issue as well where we get null value.


Thanks and Regards

Last Updated: 17 Apr 2024 14:41 by ADMIN
To reproduce: please refer to the attached sample project and gif file.

Workaround: use the CellFormatting event and apply the light orange BackColor for the selected cells belonging to the current pinned column:

private void radGridView1_CellFormatting(object sender, Telerik.WinControls.UI.CellFormattingEventArgs e)
    if (e.Row.IsSelected && e.Column.IsCurrent)
        e.CellElement.BackColor = Color.FromArgb(255, 231, 174);
        e.CellElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);
Last Updated: 17 Apr 2024 14:40 by ADMIN

Steps to reproduce:

1. Bind the grid to BindingList

2. Call BestFitColumns method in form's constructor

3. Use Fluent/Crystal theme

4. Rebind the grid by setting DataSource=null

5. Exception is thrown

Stack trace:

en Telerik.WinControls.UI.BestFitHelper.SetColumnWidth(GridViewColumn column, Single desiredWidth)
   en Telerik.WinControls.UI.BestFitHelper.BestFitColumnCore(GridViewColumn column, BestFitColumnMode mode)
   en Telerik.WinControls.UI.BestFitHelper.ProcessRequests()
   en Telerik.WinControls.UI.GridTableElement.UpdateAll()
   en Telerik.WinControls.UI.GridTableElement.UpdateViewCore(Object sender, DataViewChangedEventArgs args)
   en Telerik.WinControls.UI.GridTableElement.UpdateView(Object sender, DataViewChangedEventArgs args)
   en Telerik.WinControls.UI.GridTableElement.ProcessTemplateEvent(GridViewEvent eventData)
   en Telerik.WinControls.UI.GridTableElement.Telerik.WinControls.UI.IGridViewEventListener.ProcessEvent(GridViewEvent eventData)
   en Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
   en Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessEvent(GridViewEvent gridEvent)
   en Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
   en Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
   en Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
   en Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewTemplate template, GridViewEvent eventData, Boolean postUI)
   en Telerik.WinControls.UI.GridViewTemplate.DispatchEvent(GridViewEvent gridEvent, Boolean postUI)
   en Telerik.WinControls.UI.GridViewTemplate.DispatchDataViewChangedEvent(Object sender, DataViewChangedEventArgs args)
   en Telerik.WinControls.UI.GridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
   en Telerik.WinControls.UI.MasterGridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
   en Telerik.WinControls.UI.GridViewTemplate.CollectionView_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   en Telerik.WinControls.Data.RadCollectionView`1.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
   en Telerik.WinControls.Data.RadDataView`1.RebuildData(Boolean notify)
   en Telerik.WinControls.Data.RadDataView`1.RefreshOverride()
   en Telerik.WinControls.Data.RadDataView`1.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
   en Telerik.WinControls.Data.RadCollectionView`1.source_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   en Telerik.WinControls.Data.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   en Telerik.WinControls.Data.RadListSource`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   en Telerik.WinControls.Data.RadListSource`1.EndUpdate(Boolean notifyUpdates)
   en Telerik.WinControls.Data.RadListSource`1.Initialize()
   en Telerik.WinControls.Data.RadListSource`1.Bind(Object dataSource, String dataMember)
   en Telerik.WinControls.Data.RadListSource`1.set_DataSource(Object value)
   en Telerik.WinControls.UI.GridViewTemplate.set_DataSource(Object value)
   en Telerik.WinControls.UI.RadGridView.set_DataSource(Object value)

Last Updated: 17 Apr 2024 14:37 by ADMIN
To reproduce: add a RadGridView with several columns. Set the Enabled property to false. Try to open the Property Builder and you will notice that the Columns are disabled in it.

Workaround: set the Enabled property to false at run time. Thus, it would be possible to manipulate the columns via the Property Builder at design time.
Last Updated: 17 Apr 2024 14:36 by ADMIN
Created by: Dess | Tech Support Engineer, Principal
Comments: 0
Category: GridView
Type: Bug Report
To reproduce:

Please run the sample project and follow the steps from the gif file.


        private void radGridView1_SizeChanged(object sender, EventArgs e)

        public class Grid : RadGridView
            public override string ThemeClassName  
                    return typeof(RadGridView).FullName;  

            protected override void OnResize(EventArgs e)
                object value = null;
                if (this.ActiveEditor != null)
                    value = this.ActiveEditor.Value;  
                if (value != null && this.CurrentCell != null)
                    this.CurrentCell.Value = value;
Last Updated: 17 Apr 2024 14:35 by ADMIN
To reproduce: please refer to the attached sample project. Note that the CellValidating event is fired twice even without showing a RadMessageBox. With an MS Button the problem is not reproducible.

Workaround: use the RadGridView.ValueChanging event to perform validation while the user is typing in the active editor:
 private void radGridView1_ValueChanging(object sender, Telerik.WinControls.UI.ValueChangingEventArgs e)
   if (((string)e.NewValue) != "x")
         RadMessageBox.Show("Only 'x' allowed!");
         e.Cancel = true;

Last Updated: 17 Apr 2024 14:30 by ADMIN

I have a radGridView with MutliSelect set to true and SelectionMode set to FullRowSelect. A theme is applied, and this behavior is seen with other themes too. Several columns are pinned to the left.

When I multi-select rows using the shift or control buttons by clicking one of the cells under the frozen columns, the row is selected and colored accordingly, except for the cell that was actually clicked which remains with the unselected color.

If I multi-select by clicking on one of the cells under an unpinned column, the full row is selected as expected.

In the image below, I held down shift and selected the first and third row in sequence under the Officer column.

How can I fix this to show the complete row selected?

Last Updated: 17 Apr 2024 14:29 by ADMIN
To reproduce:
ColumnGroupsViewDefinition view = new ColumnGroupsViewDefinition();
view.ColumnGroups.Add(new GridViewColumnGroup("Customer Contact"));

view.ColumnGroups[0].Rows.Add(new GridViewColumnGroupRow());


radGridView1.Columns[0].Width = 300;
radGridView1.Columns[1].Width = 300;
radGridView1.ViewDefinition = view;

for (int i = 0; i < 10; i++)
    radGridView1.Rows.Add("test test test test test", "test");

Last Updated: 12 Apr 2024 05:46 by Evaristo
To reproduce the issue:
Click the first cell of a column
Scroll down and press Shift key and click the last cell of the column
Check that total rows label is 20.000 but selected cells label is less than 19.997
1 2 3 4 5 6