Hi Hrvoje,
Thank you for posting your query to us.
You can try these code snippet to clear the grid :
this.gridDataBoundGrid1.BeginUpdate();
this.gridDataBoundGrid1.DataSource=null;
this.gridDataBoundGrid1.Binder.InternalColumns.Clear();
this.gridDataBoundGrid1.EndUpdate();
this.gridDataBoundGrid1.Refresh();
Please refer to the attached sample for implementation and let me know if this helps.
http://www.syncfusion.com/Support/user/uploads/ClearData_1014ac80.zipBest regards,
Sarathi