How To Bind ASP dropdown in RAdGrid

[Perry]

I have this RAD Grid

 

<telerik:RadGrid ID="gvMembers" runat="server"
            AutoGenerateColumns="false"
            OnNeedDataSource="gvMembers_NeedDataSource"
            AllowSorting="true"
            AllowPaging="true"
            PageSize="10"
            AllowAutomaticUpdates="true"
            AllowAutomaticInserts="true"
            AllowAutomaticDeletes="true"
            OnItemCreated="gvMembers_ItemCreated"
            OnItemInserted="gvMembers_ItemInserted"
            OnPreRender="gvMembers_PreRender"
            OnInsertCommand="gvMembers_InsertCommand"
            OnItemDataBound="gvMembers_ItemDataBound"
            OnUpdateCommand="gvMembers_UpdateCommand"
            OnDeleteCommand="gvMembers_DeleteCommand"

            >
            <HeaderStyle CssClass="GridHeader" />
            <PagerStyle Mode="NextPrevNumericAndAdvanced" />
            <MasterTableView AutoGenerateColumns="false" DataKeyNames="UserID" CommandItemDisplay="Top" InsertItemPageIndexAction="ShowItemOnCurrentPage">
                <Columns>
                    <telerik:GridEditCommandColumn></telerik:GridEditCommandColumn>
                    <telerik:GridBoundColumn DataField="UserID" HeaderText="UserID" ReadOnly="true" UniqueName="UserID"></telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="FirstName" HeaderText="First Name" SortExpression="FirstName" UniqueName="firstname"></telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="FirstName" HeaderText="Last Name" SortExpression="LastName" UniqueName="lastname"></telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="UserName" HeaderText="User Name" SortExpression="UserName" UniqueName="username"></telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="EmailAddress" HeaderText="Email" SortExpression="EmailAddress" UniqueName="email"></telerik:GridBoundColumn>

                    <telerik:GridTemplateColumn UniqueName="TemplateColumn" HeaderText="Role">
                        <ItemTemplate>
                            <asp:Label ID="Label1" runat="server"
                                Text='<%# DataBinder.Eval(Container.DataItem, "Role") %>'>
                            </asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:DropDownList ID="ddlRole" runat="server" DataTextField="Role1" DataValueField="RoleID"></asp:DropDownList>
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                    <telerik:GridButtonColumn ConfirmText="Delete this Member?" ConfirmDialogType="RadWindow"
                        ConfirmTitle="Delete" ButtonType="PushButton" Text="Delete" CommandName="Delete" />
                </Columns>
            </MasterTableView>
        </telerik:RadGrid>

 

I need to bind the asp dropdown list for my Update and Insert.

I tried this C# code:

protected void gvMembers_ItemDataBound(object sender, GridItemEventArgs e)
        {

            DropDownList ddl = (DropDownList)e.Item.FindControl("ddlRole");
            ddl.SelectedValue = (string)DataBinder.Eval(e.Item.DataItem, "Role1").ToString();

        }

 

But it gets an error message {"Object reference not set to an instance of an object."} when I try to view the web page.

 

What is the proper procedure to accomplish this?