WPF, How to add column in datagrid?

WPF 4 has its own DataGrid, the column you created is from that namespace, it is not compatible with the Toolkit-DataGrid. If you use WPF 4 you probably should not use the Toolkit DataGrid at all.

I know but it does not adds columns even vs gives such error : Error 2 Argument 1: cannot convert from 'System.Windows.Controls. DataGridTemplateColumn' to 'Microsoft.Windows.Controls. DataGridColumn – Acid Jul 31 at 10:00 1 @Acid: Why don't you add the error to the bloody question then?

– H.B. Jul 31 at 10:01 @Acid: Edited answer. – H.B. Jul 31 at 10:05.

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