Hi Anika,
Add BoundColumn to the Grid:
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To add the column to your grid, you just do it by working with the underlying data source.Below is a code snippet
DataTable dt = this.gridDataBoundGrid1.DataSource as DataTable;
this.gridDataBoundGrid1.BeginUpdate();
dt.Columns.Add();
this.gridDataBoundGrid1.EndUpdate(true);
this.gridDataBoundGrid1.Refresh();
Add UnboundColumn ( it doesn't related to the datatable) :
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You can add an unbound column to the grid, and then use the grid.Model.QueryCellInfo and SaveCellInfo events to provide and save the unbound values for this column.
Please refer to the KB article link below for a sample on this.
http://www.syncfusion.com/support/kb/grid/Default.aspx?ToDo=view&questId=305Best Regards,
Haneef