ths is my griedview --------------------i want if i selectall all ckbox should get selected---------------
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"
AllowPaging="true" DataKeyNames="messageuid">
<Columns>
<asp:TemplateField HeaderText="Select">
<HeaderTemplate >
<asp:CheckBox ID="chkSelectall" runat="server" Text="Select All" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="MessageID" DataField="messageuid" />
<asp:BoundField HeaderText="Messages" DataField="message" />
</Columns>
</asp:GridView>