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)

The main purpose is optimizing memory consumption and performance when generating large pdf documents.

Resource: https://www.telerik.com/blogs/pdf-stream-processing-reliable-and-efficient-processing-of-pdf-files 

I want that the user can select a value from al list like in excel:

Currently, when using the Excel-like filtering and RadListFilterPopup it does not allow filtering by time, only by date:

When you have a checkbox column in the grid and group by a certain column, you should have the possibility to check-all rows inside a group without the necessity of expanding the group and checking each separate row.

The group row should have a checkbox as well. When you toggle it, all data rows or nested groups should also be toggled. The parent group should also be adjusted correctly.

Workaround: The following knowledge base article demonstrates a sample approach how to extend the default group row and add a checkbox. However, it would be necessary to modify and extend it in a way to cover the cases with nested groups:

https://www.telerik.com/support/kb/winforms/details/check-all-functionality-in-group-rows 

Please refer to the attached sample project. 

If the main Cars list is not empty, the child templates have correct captions:

However, if initially there are no Cars and you add a new one via the new row, the captions of the child template remains with the default value ("table"):

Currently, when you update the value of the checkbox cell (toggle/untoggle), Narrator reads the value only the first time after selecting the cell. Each next checking/unchecking does nothing.

It is expected from the Narrator to read the value of the RadCheckBoxEditor when it is being activated after entering edit mode. It the column uses EditMode.OnValueChange, the value changes also should be read by the Narrator.

Hi

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

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?

Please refer to the attached sample project. When the expander is in the columns that contains long text that has be resize the rows, the AutoSizeRows functionality doesn't work properly:

Workaround: set the MasterTemplate.SelfReferenceExpanderColumn property to a column that contains very short content:  

Me.RadGridView1.MasterTemplate.SelfReferenceExpanderColumn = Me.RadGridView1.Columns(1)

Hello.

In my application, depending on the specific data in the grid I may want to warn a user who clicks on the header checkbox that changing all the values in that column may not be what he intends, allowing him to cancel out of the operation.  I haven't found a handler that gets called when clicking on the header checkbox that allows me to cancel the event.  How can I accomplish this?

Hello,

I am using a radGridView on a Windows touch screen. When I am trying to scroll the rows by hand (EnableKineticScrolling was set to true), the scrolling process is very slow. If I will use the vertical scrollbar, then it is ok. How can I achieve this without using the vertical scrollbar?

I used EnableFastScrolling=true, but I did not see any improvement.

Regards,

Yannis

Hi, 

I have to transfer data from gridview to a .xlsm file which is for the salary transfer to the bank from the application (Template given by the Bank).

File screenshot attached. 

Need to fill the cells from the loaded gridview to this template.

Please help; I have searched a lot but no luck.

Thank you very much.

Hi,

when I select the column chooser multiple times via context menu, the column chooser dialog scales multiple times.

Reproduced here with the Telerik sample application. 150 % dpi scaling.

Regards

Erwin

I'm just starting with RadGridView and trying to figure out how to create a combobox column inside my RadGridView.  I've added a column that is of type GridViewComboBoxColumn.  I've created a BindingSource that Contains the values for the combobox.  I can't figure out how to set the datasource property of the Column to use that BindingSource.  Google search says to set the datasource property but when I'm going through the "Open Properties Builder"  and I select my combobox column I don't see that property listed under advanced for the column.

Thanks

Lee

If you want to use Conditional Formatting via code (expression based formatting) you will see that it throws an exception if you set TRIM() condition.

ExpressionFormattingObject expressionCondition = new ExpressionFormattingObject(
expressionCondition.Expression = "TRIM(ContactName) = 'Maria Anders'";
expressionCondition.CellBackColor = Color.Aqua;
this.radGridView1.Columns["CustomerID"].ConditionalFormattingObjectList.Add(expressionCondition);

There is no exception if you use the same condition via "Conditional Formatting Rules Manager" form.