Hi Venkataramu,
You can add new rows in the GridControl by increasing the row count. Below is the code snippet:
this.gridControl1.Model.Data.RowCount++;
Please refer the sample and letus know if this helps.
http://websamples.syncfusion.com/samples/Grid.Windows/F71039/main.htmKindly let us know if you need any further assistance.
Best Regards,
Jeba.