[Solved] NullReferenceException while clearing the grid columns

[Zainab Vora]

Hello,

I am currently trying to clear columns from RadGridView. I am using  _grid.Columns.Clear() to do so.

It works fine if the columns count is 0.

However, If the grid contains columns, it crashes with a NullReferenceException. "Object reference not set to an instance of an object."
 
Is there any other way to clear all the columns?

Currently I am using Version 2010.1.603.1030.  Thank you.

[Zainab Vora]

at Telerik.Windows.Controls.GridViewSelectColumn.OnOwnerChanged(GridViewDataControl oldOwner, GridViewDataControl newOwner)
  at Telerik.Windows.Controls.GridViewColumn.set_DataControl(GridViewDataControl value)
  at Telerik.Windows.Controls.GridView.GridViewDataControl.UpdateGridViewDataControlReference(IList list, Boolean clear)
  at Telerik.Windows.Controls.GridViewColumnCollectionInternal.ClearItems()
  at System.Collections.ObjectModel.Collection`1.Clear()
  at CpgPortfolioAnalysis.GridView.GridView.UpdateColumns()

Above is the Stack trace.

[Veselin Vasilev]

Hello Zainab Vora,

Do you modify the ItemsSource of the gridview before clearing the columns?

Can you try with a more recent version (preferable in Silverlight 4)?

Kind regards,
Veselin Vasilev
the Telerik team

[Zainab Vora]

Hello,

Thank you for quick response.

I am not modifying the ItemsSource of the gridview.

We are currently using silverlight 3 and silverlight 4 is not an option.

Is there any another way??

Thanks

 

[Vlad]

Hello,

 Can you post the exact version of the grid?

Best wishes,
Vlad
the Telerik team

[Vlad]

Hello,

 I've missed the version in your first post. Sorry! Do you have GridViewSelectColumn declared in your case? If this is the case you can download our latest official Silverlight 3 binaries - Q2 2010 SP1.

All the best,
Vlad
the Telerik team