Delete GridView Rows using DeleteCommand in SqlDataSource in ASP.Net

Hi,sir 

How to write a delete query which can delete a specific row from grid view? Help !!

 i worte this 

DeleteCommand="DELETE FROM member"

 It delete all my entry in table called member. =( 

 <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:FYPConnectionString %>" 
        SelectCommand="SELECT * FROM [member]" DeleteCommand="DELETE FROM member"></asp:SqlDataSource>