DropDownList onselectedindexchanged not firing with GridView Asp.net C#.

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ASP.NET4

Dear All,
I am using Asp.Net VS2010 and C#. I am use Dropdownlist with in Gridview. Dropdownlist onselectedindexchanged not firing i am using following code.

//HTML

<asp:TemplateField HeaderText = "Action">
           <ItemTemplate>

               <asp:DropDownList ID="ddlCountries" runat="server" CssClass="ddl" Width="110px"
               onselectedindexchanged="ddlCountries_SelectedIndexChanged"  AutoPostBack="true" Enabled="true" >
                   <asp:ListItem Text="---Select---" Value="---Select---"></asp:ListItem>
                   <asp:ListItem Text="Pending" Value="Pending"></asp:ListItem>
                   <asp:ListItem Text="Approve" Value="Approve"></asp:ListItem>
                   <asp:ListItem Text="Cancel" Value="Cancel"></asp:ListItem>
               </asp:DropDownList>
           </ItemTemplate>

     

       </asp:TemplateField>

//Code behind

protected void ddlCountries_SelectedIndexChanged(object sender, EventArgs e)
   {
       string empid = "";
       string sno = "";


       DropDownList ddl = (DropDownList)sender;
       GridViewRow row = (GridViewRow)ddl.Parent.Parent;
       int idx = row.RowIndex;

       DropDownList ddlStatus = (DropDownList)row.FindControl("ddlStatus");
       Label lblEmpCode = (Label)row.FindControl("lblSno2");
       Label lblsno = (Label)row.FindControl("lblSno");

       empid = lblEmpCode.Text;

       sno = lblsno.Text;

       string status = "";

       string ApproveId = empCode;

       if (ddlStatus.Text == "---Select---")
       {
           return;
       }

       if (ddlStatus.Text == "Approve")
       {
           status = "Approved";
       }

       if (ddlStatus.Text == "Pending")
       {
           status = "Pending";
       }

       else
       {
           status = "Cancel";
       }

   }

Any one please help me.

Sorry for my English.

Thanks for Advance!..