GridView Row Editing DropDownList: Object reference not set to an instance of an object.

 I am trying to implement the code from Mr. Mudassar:

http://www.aspsnippets.com/Articles/Populate-DropDownList-with-Selected-Value-in-EditItemTemplate-of-GridView-in-ASPNet.aspx

I have a database table with Integer type.

Here is the running code line:

 Code in GridView:

         <asp:TemplateField HeaderText="RegionNavn">
                        <ItemTemplate>
                            <%# Eval("RegionNavn")%>
                        </ItemTemplate>
                        <EditItemTemplate>
                           <asp:Label ID="lblRegionNavn" runat="server" Text='<%# Eval("RegionNavn")%>' Visible = "false"></asp:Label>
                            <asp:DropDownList ID="dropDownRegionNavn" runat="server" Width="150px" AutoPostBack="true">
                            </asp:DropDownList>
                        </EditItemTemplate>
        </asp:TemplateField>

Code in Method GridView_UpdateRecord:

DropDownList    ddRegionID   = (DropDownList)row.FindControl("dropDownRegionNavn");

dCmd.Parameters.Add("@RegionID", SqlDbType.Int).Value   = int.Parse(ddRegionID.SelectedValue);

 ---------------------------------------------------------------------------------

 Code in Method GridView_RowDataBound:

          if (e.Row.RowType == DataControlRowType.DataRow && GridView1.EditIndex == e.Row.RowIndex)
          {
              DropDownList ddlRegionNavn = (DropDownList)e.Row.FindControl("dropDownRegionNavn");
              string query = "select distinct RegionNavn from kart_Region";
              SqlCommand cmd = new SqlCommand(query);
              ddlRegionNavn.DataSource = GetData(cmd);
              ddlRegionNavn.DataTextField = "RegionNavn";
              ddlRegionNavn.DataValueField = "RegionNavn";
              ddlRegionNavn.DataBind();
              ddlRegionNavn.Items.FindByValue((e.Row.FindControl("lblRegionNavn") as Label).Text).Selected = true;

-----------------------------------------

On Edit Click, the DropDownList in the GridView brings the previously selected value

 On Update Click, the error is: "System.FormatException: Input string was not in a correct format."

dCmd.Parameters.Add("@KystverketRegionID", SqlDbType.Int).Value = int.Parse(ddKystverketRegionID.SelectedValue);

 When I use the following code:

 ddlRegionNavn.DataTextField = "RegionNavn"; 
ddlRegionNavn.DataValueField = "RegionID";  // from RegionNavn to RegionID

On Edit Click, the DropDownList values in the GridView is not firing and the following error shows:

Object reference not set to an instance of an object.

How to implement the code from Mr. Mudassar when having a value of type Int ?
Any Suggestions will be highly appreciated?