Why Can I not Access This Control

I am using a Telerik RadGrid and have an ASP Dropdown List within an EditItemTemplate as shown in the code below.

<telerik:GridTemplateColumn UniqueName="TemplateColumn" HeaderText="Role"><ItemTemplate><asp:Label ID="lblRole" runat="server"
                        Text='<%# DataBinder.Eval(Container.DataItem, "Role") %>'></asp:Label></ItemTemplate><EditItemTemplate><asp:DropDownList ID="ddl1" runat="server" UniqueName="Roles"/></EditItemTemplate></telerik:GridTemplateColumn>

I am attempting to populate the dropdown using Entity Framework with this C# code:

protected void gvMembers_ItemDataBound(object sender, GridItemEventArgs e)
        {
            var roles = (from c in DbContext.roles
                         select new { c.Role1, c.RoleID }).ToList();
            GridEditableItem item = e.Item as GridEditableItem;

            //// access/modify the edit item template settings here
            DropDownList list = item.FindControl("Roles") as DropDownList;
            list.DataTextField = "Role1";
            list.DataValueField = "RoleID";
            list.DataBind();

        }

I am getting an "Object reference not set to an instance of an object." Since I am relatively new to programming I am stumped by this error message it appears to me I am not able to find that Roles control.  I have attempted to use the Control ID put get the same results. I have spent a lot of time trying to solve this problem so any help with this would be great.