Hi Venkat,
Sorry for the delay in response.
Normally if you drag and drop the GridControl from the ToolBox it contains 10 rows and 10 columns by default. If you want to control this you can make use of the RowCount and ColCount property in the properties window or through code.
Please refer the below sample and modify the sample to show the extra row issue, that will help us to spot the issue and provide you the solution early. Here is the sample link:
http://websamples.syncfusion.com/samples/Grid.Windows/F70936/main.htmCould you please explain me in which situation you are getting the extra row issue?
Regards,
Jeba.