<asp:templatefield headertext="CheckBox" itemstyle-horizontalalign="Center" xmlns:asp="#unknown">
<itemtemplate>
<asp:checkbox id="Chk1" runat="server" checked="<%#Eval("Check") %>" />
</itemtemplate>
</asp:templatefield>
"Check" is the field name which we select from the database
and that field in database shoult be bit