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c#.netlinqsilverlighttelerik-grid

How to find hidden columns in Telerik Radgridview using Linq expression

How to find invisible columns from Telerik Radgridview.I tried with following expression 

RadGridView radGridView = dependencyObject as RadGridView;
var columns = radGridView.Columns.Where(x => x.IsVisible == false);

I got following exception

Error 1 'Telerik.Windows.Controls.GridViewColumnCollection' does not contain a definition for 'Where' and the best extension method overload 'Telerik.Windows.Data.QueryableExtensions.Where(System.Linq.IQueryable, Telerik.Windows.Data.FilterDescriptorCollection)' has some invalid arguments

Can anyone help on this

Solution 
  • var columns = new List<Telerik.Windows.Controls.GridViewColumn>(gridView.Columns);
var filteredList = columns.Where(o => o.IsVisible == false);

    Cheers