[Solved] Grouping problem in Grid

[C J]

Hi,
I have very small no. of columns & about 20,000 rows of data. When I try to drag a column to the header (in order to group the data), I receive an error

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; InfoPath.2; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MS-RTC EA 2)
Timestamp: Fri, 4 Dec 2009 18:07:50 UTC

Message: Unhandled Error in Silverlight Application
Code: 4004   
Category: ManagedRuntimeError      
Message: System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
   at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Collections.Generic.List`1.Enumerator.MoveNext()
   at System.Linq.Enumerable.<CastIterator>d__aa`1.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.Sum(IEnumerable`1 source)
   at System.Linq.Enumerable.Sum[TSource](IEnumerable`1 source, Func`2 selector)
   at Telerik.Windows.Data.GroupExtensions.LeavesCount(IEnumerable`1 groups)
   at Telerik.Windows.Data.QueryableCollectionView.get_ItemCount()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnCollectionViewCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.QueryableCollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
   at Telerik.Windows.Data.QueryableCollectionView.RefreshAndRaiseCollectionChanged(NotifyCollectionChangedEventArgs args)
   at Telerik.Windows.Data.QueryableCollectionView.Refresh()
   at Telerik.Windows.Data.QueryableCollectionView.EndDefer()
   at Telerik.Windows.Data.QueryableCollectionView.DeferHelper.Dispose()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.PerformGrouping(String member, Object displayContent, Nullable`1 insertionIndex)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.<>c__DisplayClass2a.<GroupingRequested>b__29()
   at Telerik.Windows.Controls.CursorManager.PerformTimeConsumingOperation(FrameworkElement frameworkElement, Action action)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.GroupingRequested(Object origin, GroupingRequestedEventArgs e) 

Am I missing something in the grid. Please can anyone help me out.

[Vlad]

Hello,

Can you post a bit more info about your grid version and how or where we can reproduce this?

Kind regards,
Vlad
the Telerik team

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[C J]

Hi,

We had a talk with Telerik support team & they said the issue is fixed in Q3 version. We already downloaded the appropriate DLLs & trying to reolve this error.

Thanks.