gridview control problem - asp.net

Question

work on C# asp.net vs05. i take a combo on gridview template field.
<asp:GridView ID="GridView3" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource3">
<Columns>
<asp:BoundField DataField="StudentID" HeaderText="StudentID" ReadOnly="True" SortExpression="StudentID" />
<asp:TemplateField HeaderText="DivisionName" SortExpression="DivisionName">
<ItemTemplate>
<asp:Label ID="lblDivisionName" runat="server" Text='<%# Bind("DivisionName") %>'
Width="116px"></asp:Label><br />
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="StudentName" SortExpression="StudentName">
<EditItemTemplate>
<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("StudentName") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("StudentName") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:ButtonField ButtonType="Button" Text="Update" />
</Columns>
</asp:GridView>
Now i want to fill this combo by the bellow code ?
DropDownList1.DisplayMember = "CommercialRegionName";
foreach (object oItem in collection)
{
DropDownList1.Items.Add(oItem);
}
how to get the combo control id from the grid

Answer 1

You can use the following code:
Set OnRowDataBound of the gridview in aspx as OnRowDataBound="GridView3_RowDataBound"
Then put the following code in aspx.cs page.
protected void GridView3_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList DropDownList1 =(DropDownList) e.Row.FindControl("DropDownList1");
DropDownList1.DisplayMember = "CommercialRegionName";
foreach (object oItem in collection)
{
DropDownList1.Items.Add(oItem);
}
}
}