Editing Dropdownlist Inside Gridview

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VB

I have a DLL inside gridview item template. When editing a particular row, the corresponding value will be selected in the dropdownlist.

My gridview looks like this:

<asp:GridView  ID="gvCabinDetails" runat="server" EditRowStyle-BackColor="#f9fae7" RowStyle-BorderColor="#c7c7fa" AutoGenerateColumns="False" DataKeyNames="DecNo,CabinNo" AllowPaging="True" PageSize="5">
  <Columns>
      <asp:BoundField DataField="CabinNo" HeaderText="CabinNo" ReadOnly="True" />
         <asp:TemplateField HeaderText="DeckName">
          <EditItemTemplate>
          <table>
          <tr>
          <td>
             <asp:DropDownList ID="ddlDeckNo" runat="server"  ></asp:DropDownList>
          </td>
          <td>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="ddlDeckNo" InitialValue="0" ErrorMessage="DecNo is Required">*</asp:RequiredFieldValidator>
          </td>
          </tr>
          </table>
             </EditItemTemplate>
          <ItemTemplate>
              <asp:Label ID="lblDeckNo" runat="server" Text='<%# Bind("DecName") %>'></asp:Label>
          </ItemTemplate>
      </asp:TemplateField>
<asp:CommandField ShowEditButton="True"  />

In the row editing event, I wrote some code like given below:

'Dim ddl As DropDownList = CType(gvCabinDetails.Rows(e.Row.RowIndex).FindControl("ddlDeckNo"), DropDownList)
           If Not ddl Is Nothing Then
               ddl.DataSource = objCabinDetails.SelectDeckNo
               ddl.DataTextField = "DecName"
               ddl.DataValueField = "DecNo"
               ddl.DataBind()
           End If