Finding DropDownList inside Item_Updating event

Its ItemUpdating not RowUpdating Joginder Banger sir

try the following code Harsh Jani
 protected void detailsview_RowUpdating(object sender, DetailsViewUpdateEventArgs e)
  {
  Dropdownlist ddlname = (Dropdownlist)yourdetialsname.Rows[e.RowIndex].FindControl("idname");
 
  detailsview.EditIndex = -1;
  BindCountry();
  }

 In this way you can findcontrol .

   protected void DetailsView1_ItemUpdating(object sender, DetailsViewUpdateEventArgs e)
        {
            string Empid = e.CommandArgument.ToString();
            TextBox txtname = (TextBox)DetailsView1.FindControl("txtEmpname");
            TextBox txtEmp_Address = (TextBox)DetailsView1.FindControl("txtEmp_Address");
            TextBox txtEmp_Department = (TextBox)DetailsView1.FindControl("txtEmp_Department");
     
            SqlCommand cmd = new SqlCommand("Usp_Insert_Update", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@EmpId", Empid);
            cmd.Parameters.AddWithValue("@Emp_Name",txtname.Text);
            cmd.Parameters.AddWithValue("@Emp_Address",txtEmp_Address.Text);
            cmd.Parameters.AddWithValue("@Emp_Department",txtEmp_Department.Text);
            cmd.Parameters.AddWithValue("@QueryID", 2);
            con.Open();
            cmd.ExecuteScalar();
            con.Close();
            DetailsView1.ChangeMode(DetailsViewMode.ReadOnly);
            AllDetailsDataBind();
            
        }
    For more Details you can visit this site and check.

 http://dotnet-sai.blogspot.in/p/all-gridview-example.html