Hi Sathish,
This can be done using the following code
DataCollection dc = this.gridGroupingControl1.DataSource as DataCollection;
for(int i = 0;i< dc.Count;i++)
dc[i].Checked = !dc[i].Checked;
this.gridGroupingControl1.Table.TableDirty = true;
this.gridGroupingControl1.Table.EndEdit();
this.gridGroupingControl1.Refresh();
Here is a sample for your reference
Sample:
http://websamples.syncfusion.com/samples/Grid.Windows/F67162/main.htmKindly take a look and let me know if you need any further assistance.
Regards,
Ajish.