Hi Navaneeth,
To have numbered rowheaders in a GridDataBoundGrid, try these property settings. This will help you.
this.gridDataBoundGrid1.BaseStylesMap["Row Header"].StyleInfo.CellType = "Header";
this.gridDataBoundGrid1.Model.Options.NumberedRowHeaders = true;
Thanks for using Syncfusion Products.
Regards,
Rajagopal