How to Bind DropDownlist in c#.net

[usmnaaan]

<asp:TemplateField HeaderText="Group_Id"> <ItemTemplate> <asp:Label ID="G1" runat="server" Text='<%# Eval("Group_Id") %>'></asp:Label> </ItemTemplate> <EditItemTemplate> <asp:TextBox ID="G2" runat="server" Text='<%# Eval("Group_Id") %>'></asp:TextBox> </EditItemTemplate> <FooterTemplate> <asp:DropDownList ID="G3" runat="server" AutoPostBack="True" 
                                    onSelectedIndexChanged=" Group_Item_Name_SelectedIndexChanged" Width="133px"> </asp:DropDownList> </FooterTemplate> </asp:TemplateField>

on running i find this error

Compiler Error Message: CS1061: 'ASP.webform12_ aspx' does not contain a definition for 'Group_Item_Nam e_SelectedIndex Changed' and no extension method 'Group_Item_Nam e_SelectedIndex Changed' accepting a first argument of type 'ASP.webform12_ aspx' could be found (are you missing a using directive or an assembly reference?)

Source Error:



Line 143: </EditItemTemplat e>
Line 144: <FooterTemplate >
Line 145: DropDownList ID="G3" runat="server" AutoPostBack="T rue"
Line 146: onSelectedIndex Changed=" Group_Item_Name _SelectedIndexC hanged" Width="133px">
Line 147:</asp:DropDownLis t>

[PsychoCoder]

It's saying you dont have a method named Group_Item_Name _SelectedIndexC hanged. Do you?