By default, the columns will be displayed as per the datasource that assigned to grid. In order to add unbound columns in the GridDataBoundGrid, the following steps can be used,
1. Create GridBoundColumnsCollection to be added to grid and copies of all members in this collection.
2. Create the Custom column and add it to the collection by using Add method.
3. If you want to add the column at specified index, you can use Insert method.
4. Bind the created column collection to GridDataBoundGrid column collection.
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