Select Last Item in DropDownList in ASP.Net | Set Last Item of DropDownList as Selected in ASP.Net

I am inserting a new states in the table from dropdown list , the dropdown list has new in the list, clicking on new gets me a pop up which takes the new state and inserts in a table. My requirement is I want to get the last inserted state in the dropdownlist and its id  to be selected as soon as insertion is done.

The second function is to insert the contact details where i have countryid,stateid,cityid

Please give me a solution

  protected void stateSave(object sender, EventArgs e)
        {
            using (SqlConnection conn = new SqlConnection(cs))
            {
                SqlCommand cmd = new SqlCommand("newStates", conn);
                cmd.CommandType = CommandType.StoredProcedure;
                SqlParameter outparm = new SqlParameter("@stateID", SqlDbType.Int);
                outparm.Direction = ParameterDirection.Output;

                cmd.Parameters.Add(outparm);
                cmd.Parameters.AddWithValue("@statename", state.Value);
                cmd.Parameters.AddWithValue("@countryID", countrydropdown.SelectedValue);
                conn.Open();
                cmd.ExecuteNonQuery();
                stateID = Convert.ToInt32(outparm.Value);
                Panel2.Visible = true;
                Panel1.Visible = false;
            }
        }
      
  protected void submitDetails_click(object sender, EventArgs e)
        {
            using (SqlConnection conn = new SqlConnection(cs))
            {
                cmd = new SqlCommand("insertContact", conn); /* executes insertContact procedure and insert records
                                                               into Contact table.This is the first procedure which executes
                                                               after the user hits submit button */
                cmd.CommandType = CommandType.StoredProcedure;
                SqlParameter outparm = new SqlParameter("@contactID", SqlDbType.Int);
                outparm.Direction = ParameterDirection.Output; /* specifies the type of a parameter within a query */
                cmd.Parameters.Add(outparm);
                cmd.Parameters.AddWithValue("@fname", fname.Value);
                cmd.Parameters.AddWithValue("@mname", mname.Value);
                cmd.Parameters.AddWithValue("@lname", lname.Value);
                cmd.Parameters.AddWithValue("@countryID", countrydropdown.SelectedValue);
                cmd.Parameters.AddWithValue("@stateID", statedropdown.SelectedValue);
                cmd.Parameters.AddWithValue("@cityID", citydropdown.SelectedValue);
                cmd.Parameters.AddWithValue("@address1", Address1.Value);
                cmd.Parameters.AddWithValue("@address2", Address2.Value);
                cmd.Parameters.AddWithValue("@pincode", Pincode.Value);
                cmd.Parameters.AddWithValue("@mobile1", Mobile1.Value);
                cmd.Parameters.AddWithValue("@mobile2", Mobile2.Value);
                cmd.Parameters.AddWithValue("@phone", Phone.Value);
                cmd.Parameters.AddWithValue("@email1", Email1.Value);
                cmd.Parameters.AddWithValue("@email2", Email2.Value);
                cmd.Parameters.AddWithValue("@email3", Email3.Value);
                conn.Open();
                cmd.ExecuteNonQuery();