DataGridTextColumn header binding dynamically

I want to bind WPF DataGridTextColumn dynamically. I try as follows

<DataGrid ><DataGrid.Columns><DataGridTextColumn  Binding="{Binding NAME}" ClipboardContentBinding="{x:Null}" Header="{StaticResource colName}"    /></DataGrid.Columns></DataGrid>

when colName is null its given an exeption and I can't run the page. How can I assign a default value when colName is null?