ALLOW ONLY ONE CHECK BOX CHECKED IN GRIDVIEW

Question

Dear all i am taking checkbox in gridview as follows
But i want to allow only one checkbox to be checked at rime
means if one is checked then other will be uncehcked automatically

<asp:TemplateField> <itemtemplate> <asp:CheckBox ID="LinkAssignButton" runat="server" CommandName="Assign" Text="Take" Visible="true"> </itemtemplate>