How to retrieve image from saved path on selectedvaluechange

protected void DDLCity_SelectedIndexChanged(object sender, EventArgs e)     {         SqlConnection con = new SqlConnection(connectionString);                  SqlCommand cmd = new SqlCommand("procGetSponsorDetails",con);         con.Open();         cmd.CommandType = CommandType.StoredProcedure;         cmd.Parameters.Add("@CityId", SqlDbType.Int).Value = DDLCity.SelectedItem.Value;         SqlDataReader sdr = cmd.ExecuteReader();         //cmd.ExecuteReader();         if (sdr.Read())         {                          ImgLogoSponsor.ImageUrl = Server.MapPath("~/Templates/") + sdr[0].ToString();             LblAllotedCards.Text = sdr[10].ToString();                  }         sdr.Close(); con.Close(); } }