Data base retriving error

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
           try
           {
                button1.Enabled = true;
                button2.Enabled = true;
                button3.Enabled = true;
                textBox1.Enabled = false;

                myCon.Open();
                //int i = Convert.ToInt32(comboBox1.SelectedItem);
                //String i = comboBox1.SelectedItem.ToString();

                string sss = "select * from property where propno='" + comboBox1.SelectedItem.ToString() + "'";
                //Console.WriteLine(sss);

                OleDbCommand cmld = new OleDbCommand(sss, myCon);

                OleDbDataReader drsl = cmld.ExecuteReader();
                drsl.Read();

                textBox1.Text = drsl[0].ToString();
                textBox2.Text = drsl[1].ToString();
                textBox3.Text = drsl[2].ToString();
                textBox4.Text = drsl[3].ToString();
                textBox5.Text = drsl[4].ToString();
                comboBox2.Text = drsl[5].ToString();
                label9.Text=drsl[8].ToString();
                pictureBox1.Image = Image.FromFile(label9.Text);
                label10.Text=drsl[9].ToString();
                pictureBox2.Image = Image.FromFile(label10.Text);
                label11.Text=drsl[10].ToString();
                pictureBox3.Image = Image.FromFile(label11.Text);

                drsl.Close();
                myCon.Close();
                    

                  


                


           }
           catch (Exception ex) 
           {
            MessageBox.Show(ex.Message.ToString(), "Real Estate...    ", MessageBoxButtons.OK, MessageBoxIcon.Error); 
         }
        }