When trying to open the QuickStart solution from
C:\Program Files (x86)\Progress\Telerik UI for WinForms 2025 Q1\Examples
installation folder, the following error appears:
Visual Studio 2022 crashes when working with a solution containing two WinForms projects:
- Project 1: WinForms (.NET 9) with Telerik
- Project 2: WinForms (.NET 6) without Telerik
Steps to Reproduce:
- Create a new solution in Visual Studio 2022.
- Add two WinForms projects:
- Project 1: WinForms (.NET 9) with Telerik
- Project 2: WinForms (.NET 6) without Telerik
- Open the WinForms designer for a form in Project 1 (Telerik, .NET 9).
- Without closing the designer, open the WinForms designer for a form in Project 2 (.NET 6, no Telerik).
- Switch to the code view of the form in Project 2.
- Switch back to the WinForms designer in Project 2.
Expected Result:
Visual Studio should smoothly switch between code and designer views without issues.
Actual Result:
Visual Studio freezes and crashes after switching back to the WinForms designer in Project 2.
Environment:
- Visual Studio 2022
- Windows Version: (Windows 11 x64)
- Telerik WinForms Version: (2025.1.211)
Additional Notes:
- The issue seems to be related to handling different .NET versions and Telerik components in the same solution.
- The crash occurs consistently when following the steps above.
- No explicit error messages are shown before Visual Studio closes.
Hello team!
I've found a misbehavior on RadForm when setting the size.
When you set the Size of the Form before it actually has shown then it will do some re-calculation, change the form size several times, and ending up in a too big size. The behavior is different to a original Form and that's why I'd treat this as bug.
The first screenshot shows a RadForm that set itself to ClientSize = 500; 500 on the constructor, like usual. It ends up in a size slightly bigger then defined.
This second screenshot shows a RadForm that set itself to ClientSize on "Shown". It ends up in having the correct size.
Whenever you set a breakpoint to the method "Form1_Resize" you can capture that the first time the Size of the RadForm get changed is our "ClientSize = new Size(500, 500)". Then the Size get changed two times by RadForm itself to something slightly smaller. Lastly the Size get changed by RadForm another time, but this time slightly bigger
This behaviors can lead to inconsistent UI size, e. .g small spaces when using AutoSize = true in certain cases. But yet didn't figured completely out when exactly it happens, just that it comes from this slightly increased Size of RadForm.
Can you please take a look to it and, if it is one, report it as bug?
Thank you very much!
Regards,
Pascal
Workaround: manually increase the font of the controls
protected override void OnShown(EventArgs e)
{
base.OnShown(e);
var dpi = NativeMethods.GetSystemDpi();
this.Font = new Font(this.Font.Name, this.Font.Size * dpi.X / 96, this.Font.Style);
this.radMenu1.Font = new Font(this.radMenu1.Font.Name, this.radMenu1.Font.Size * dpi.X / 96, this.radMenu1.Font.Style);
this.radCommandBar1.Font = new Font(this.radCommandBar1.Font.Name, this.radCommandBar1.Font.Size * dpi.X / 96, this.radCommandBar1.Font.Style);
}
When I show some text and set IsWordWrapEnabled to true... the horizontalscrollbar disappears
but when I set IsWordWrapEnabled to false after this, the horizontalscrollbar does not appear
in your code I saw this:
editor.SetValue(HorizontalScrollBarVisibilityProperty, newScrollVisibility);
But this .Auto property doesn't seem te work.
Further more, next to this problem, I'd like to set this horizontalscrollbar to appear and disappear depending on the text width...
but I'm afraid this would be depending on the .auto property
When a RadValidationRule has the "PropertyName" assigned to a non-existent property, the RadVAlidationProvider.ValidateCore throws a NullReference exception because the property cannot be found via reflection and throws no error handling.
From OpenEdge ABL class, this is the code written into the forms InitializeComponent method. The "IsValid" property doesn't actually exist.
radValidationRule3:AddControl(THIS-OBJECT:myTextBox). radValidationRule3:Operator = Telerik.WinControls.Data.FilterOperator:IsNotEqualTo. radValidationRule3:PropertyName = "IsValid". radValidationRule3:ToolTipText = "Test". radValidationRule3:Value = TRUE.
While we don't expect the functionality to actually work because the property isn't actually available to .NET, but the NullReferenceException is poorly handled.
I've attached a screenshot of the bit of code from RadValidationProvider.ValidateCore where this occurs. This is from version 2020.3.1020.20
Here is the thrown stack exception details from visual studio.
System.NullReferenceException
HResult=0x80004003
Message=Object reference not set to an instance of an object.
Source=Telerik.WinControls.UI
StackTrace:
at Telerik.WinControls.UI.RadValidationProvider.ValidateCore(Object sender, EventArgs e)
This
Me.radToggleSwith1.OffText = "OFF"
Me.radToggleSwith1.OnText = "ON"
Repro-steps:
myRadGridView.Rows.Add((GridViewDataRowInfo)null);Actual behavior
- NullReferenceException is thrown
- A new row is added.
Excepted behavior
- Or an ArgumentNullException is thrown, and no rows are added.
- Or a new row is added, and no exception is thrown.
Remark
The method AddRange is also impacted by this bug.
Set IsThreeState property to true and choose ToggleState to Indeterminate.
Office2019Dark:
Office2019Light:
When I update to version 2024.3.806 I get a build error :
I'm a Progress OpenEdge developer and found issue with RadGridView using it in a ABL application. I have been able to reproduce the issue outside of the OpenEdge environment, and have attached a project file.
To see the issue, run the app, and scroll down really quickly with scrollbar thumb to the bottom.
You will then get:
System.NullReferenceException
HResult=0x80004003
Message=Object reference not set to an instance of an object.
Source=Telerik.WinControls.GridView
StackTrace:
at Telerik.WinControls.UI.ExpressionAccessor.EvaluateExpression(GridViewRowInfo row, GridViewColumn column)
Call Stack when I'm in my project:
> WindowsFormsApp1_NetFramework.exe!Progress.Data.DataSource.FillCacheFromPVMSource(Progress.Data.CacheRow cacheRow, int rowIx) Line 579 C#
WindowsFormsApp1_NetFramework.exe!Progress.Data.DataSource.GetRowError(int rowIx) Line 651 C#
WindowsFormsApp1_NetFramework.exe!Progress.Data.DummyRow.Error.get() Line 1347 C#
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewRowInfo.ErrorText.get() Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridDataRowElement.UpdateInfo() Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridRowElement.Initialize(Telerik.WinControls.UI.GridViewRowInfo rowInfo) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridRowElement.Attach(Telerik.WinControls.UI.GridViewRowInfo row, object context) Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.BaseVirtualizedContainer<Telerik.WinControls.UI.GridViewRowInfo>.UpdateElement(int position, Telerik.WinControls.UI.GridViewRowInfo data) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.ScrollableRowsContainerElement.UpdateElement(int position, Telerik.WinControls.UI.GridViewRowInfo data) Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.BaseVirtualizedContainer<Telerik.WinControls.UI.GridViewRowInfo>.MeasureElements() Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.BaseVirtualizedContainer<Telerik.WinControls.UI.GridViewRowInfo>.MeasureOverride(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.ScrollableRowsContainerElement.MeasureOverride(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.RadElement.MeasureCore(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.RadElement.Measure(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.Layouts.ContextLayoutManager.UpdateLayout() Unknown
Telerik.WinControls.dll!Telerik.WinControls.Layouts.ContextLayoutManager.UpdateLayoutCallback(Telerik.WinControls.Layouts.ILayoutManager manager) Unknown
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.Delegate.DynamicInvokeImpl(object[] args) Line 123 C#
System.Windows.Forms.dll!System.Windows.Forms.Control.InvokeMarshaledCallbackDo(System.Windows.Forms.Control.ThreadMethodEntry tme) Unknown
System.Windows.Forms.dll!System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(object obj) Unknown
mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Line 980 C#
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Line 928 C#
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) Line 917 C#
Once I relinguish control back to Telerik, I get:
System.NullReferenceException
HResult=0x80004003
Message=Object reference not set to an instance of an object.
Source=Telerik.WinControls.GridView
StackTrace:
at Telerik.WinControls.UI.ExpressionAccessor.EvaluateExpression(GridViewRowInfo row, GridViewColumn column)
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.ExpressionAccessor.EvaluateExpression(Telerik.WinControls.UI.GridViewRowInfo row, Telerik.WinControls.UI.GridViewColumn column) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.ExpressionAccessor.this[Telerik.WinControls.UI.GridViewRowInfo].get(Telerik.WinControls.UI.GridViewRowInfo row) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridViewRowInfo.this[Telerik.WinControls.UI.GridViewColumn].get(Telerik.WinControls.UI.GridViewColumn column) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridDataCellElement.Value.get() Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridCellElement.SetContent() Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridVirtualizedCellElement.Initialize(Telerik.WinControls.UI.GridViewColumn column, Telerik.WinControls.UI.GridRowElement row) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridVirtualizedCellElement.Attach(Telerik.WinControls.UI.GridViewColumn data, object context) Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.BaseVirtualizedContainer<Telerik.WinControls.UI.GridViewColumn>.InsertElement(int position, Telerik.WinControls.UI.IVirtualizedElement<Telerik.WinControls.UI.GridViewColumn> element, Telerik.WinControls.UI.GridViewColumn data) Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.BaseVirtualizedContainer<Telerik.WinControls.UI.GridViewColumn>.UpdateElement(int position, Telerik.WinControls.UI.GridViewColumn data) Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.BaseVirtualizedContainer<Telerik.WinControls.UI.GridViewColumn>.MeasureElements() Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.BaseVirtualizedContainer<Telerik.WinControls.UI.GridViewColumn>.MeasureOverride(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.RadElement.MeasureCore(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.RadElement.Measure(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridVirtualizedRowElement.MeasureElements(System.Drawing.SizeF availableSize, System.Drawing.SizeF clientSize, System.Windows.Forms.Padding borderThickness) Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.LightVisualElement.MeasureOverride(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridRowElement.MeasureOverride(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.RadElement.MeasureCore(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.RadElement.Measure(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.VirtualizedStackContainer<Telerik.WinControls.UI.GridViewRowInfo>.MeasureElementCore(Telerik.WinControls.RadElement element, System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.ScrollableRowsContainerElement.MeasureElementCore(Telerik.WinControls.RadElement element, System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.VirtualizedStackContainer<Telerik.WinControls.UI.GridViewRowInfo>.MeasureElement(Telerik.WinControls.UI.IVirtualizedElement<Telerik.WinControls.UI.GridViewRowInfo> element) Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.BaseVirtualizedContainer<Telerik.WinControls.UI.GridViewRowInfo>.MeasureElements() Unknown
Telerik.WinControls.UI.dll!Telerik.WinControls.UI.BaseVirtualizedContainer<Telerik.WinControls.UI.GridViewRowInfo>.MeasureOverride(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.ScrollableRowsContainerElement.MeasureOverride(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.RadElement.MeasureCore(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.RadElement.Measure(System.Drawing.SizeF availableSize) Unknown
Telerik.WinControls.dll!Telerik.WinControls.Layouts.ContextLayoutManager.UpdateLayout() Unknown
Telerik.WinControls.dll!Telerik.WinControls.Layouts.ContextLayoutManager.UpdateLayoutCallback(Telerik.WinControls.Layouts.ILayoutManager manager) Unknown
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.Delegate.DynamicInvokeImpl(object[] args) Line 123 C#
System.Windows.Forms.dll!System.Windows.Forms.Control.InvokeMarshaledCallbackDo(System.Windows.Forms.Control.ThreadMethodEntry tme) Unknown
System.Windows.Forms.dll!System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(object obj) Unknown
mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Line 980 C#
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Line 928 C#
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) Line 917 C#
System.Windows.Forms.dll!System.Windows.Forms.Control.InvokeMarshaledCallback(System.Windows.Forms.Control.ThreadMethodEntry tme) Unknown
System.Windows.Forms.dll!System.Windows.Forms.Control.InvokeMarshaledCallbacks() Unknown
System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m) Unknown
System.Windows.Forms.dll!System.Windows.Forms.ScrollableControl.WndProc(ref System.Windows.Forms.Message m) Unknown
Telerik.WinControls.dll!Telerik.WinControls.RadControl.WndProc(ref System.Windows.Forms.Message m) Unknown
Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.RadGridView.WndProc(ref System.Windows.Forms.Message m) Unknown
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMessage(ref System.Windows.Forms.Message m) Unknown
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndProc(ref System.Windows.Forms.Message m) Unknown
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DebuggableCallback(System.IntPtr hWnd, int msg, System.IntPtr wparam, System.IntPtr lparam) Unknown
[Native to Managed Transition]
[Managed to Native Transition]
System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(System.IntPtr dwComponentID, int reason, int pvLoopData) Unknown
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(int reason, System.Windows.Forms.ApplicationContext context) Unknown
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoop(int reason, System.Windows.Forms.ApplicationContext context) Unknown
System.Windows.Forms.dll!System.Windows.Forms.Application.Run(System.Windows.Forms.Form mainForm) Unknown
> WindowsFormsApp1_NetFramework.exe!WindowsFormsApp1_NetFramework.Program.Main() Line 19 C#
/////////////////////////////////////////////////////////////////////////////////////////////////
The following notes will explain what we are doing, since it may not be typical.
The MaxDataGuess functionality offers a time-saving alternative for the OpenEdge BindingSource that binds to a query with
a very large result set.
Some .NET controls must know the number of records in the result set when they initialize.
By default, the ProBindingSource counts the records by reading the records in the query's result set, which can be time-consuming for large
result sets. Setting this property provides the .NET control with an estimated value to bypass the counting process.
Sometimes, the result list can contain tens of thousands records, so this functionality would be used for that use case.
The project that demonstrates the issue found with the Telerik GridView is a much simpler version of the actual OpenEdge implementation.
The Progress.Data.DataSource._actualNumberOfRecords property is just a hard coded value that takes the place of the ABL query result set list,
since this project does not include the OpenEdge specific code.
The internal implementation of the MaxDataGuess in this project is as follows:
The DataSource.Count property is originally set to 50.
See Form1.cs: pbs = new Progress.Data.BindingSource(myDataTable, maxDataGuess);
Once user scrolls through rows close to the Count property, the routine CheckForOffEnd() is called
(triggered by IDataErrorInfo.Error property).
If it determines that we are close to "current" end of rows, it adds 100 more rows calling
OnListChanged(new ListChangedEventArgs(ListChangedType.ItemAdded, ix));
to notify the grid control that we've update the Count property.
The routine FillCacheFromPVMSource() is called to fill in the CacheRow param for the specified rowIx.
The exception comes into play when the rowIx is greater than the current Count property.
If this is the case, then FillCacheFromPVMSource() updates the Count property, and also calls
OnListChanged(new ListChangedEventArgs(ListChangedType.ItemDeleted, ix));
when adjusting the Count property to notify the Telerik grid.
The exception occurs when control passes back to the Telerik code.
The rowIx is no longer valid, and the Telerik grid does not check for this.
We get the following System.NullReferenceException:
'Object reference not set to an instance of an object.'
System.NullReferenceException: Object reference not set to an instance of an object.
at Telerik.WinControls.UI.RadPrintPreviewControl.OnPaint(PaintEventArgs pevent)
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(HWND hWnd, MessageId msg, WPARAM wparam, LPARAM lparam)
The annotation line is supposed to be at 05 point but instead it is between 05 and 06.
