Can select only one check box in datagrid?

Question

Hai,
Welcome all, The web page using C#, have on datagrid. I bind data from sqlserver database successfully.I bound some datas from sqlserver successfully. Now I added one check box in itemtemplate tab. I need only one tick in one checkbox in datagrid, I dont want multiple selection, I need to prevent multiple selection in datagrid, If the client select any second checkbox, should show the error message like this " You can select only one item from datagrid" . Please help me? 
 
Regards,
Manu.