try
            {

                int row = 0;
                for (row = 0; row < 6; row++)
                {

                    if (dataGridView1.Rows[row].Cells[0].Selected == true || dataGridView1.Rows[row].Cells[1].Selected == true || dataGridView1.Rows[row].Cells[2].Selected == true || dataGridView1.Rows[row].Cells[3].Selected == true || dataGridView1.Rows[row].Cells[4].Selected == true || dataGridView1.Rows[row].Cells[5].Selected == true)
                    {
                        break;

                    }
                }
                silinecekmust = dataGridView1.Rows[row].Cells[0].Value.ToString();
                


                DialogResult cevap;
                cevap = MessageBox.Show("Kaydı silmek istediğinizden eminmisiniz", "Uyarı", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
                if (cevap == DialogResult.Yes)
                {
                    con.Open();
                    cmd.Connection = con;
                    cmd.CommandText = "DELETE from musteribilgi WHERE musteriNo=" + silinecekmust;
                    cmd.ExecuteNonQuery();
                    this.Refresh();
                    cmd.Dispose();
                    con.Close();
                    dtst.Clear();
                    dtst.Tables["musteribilgi"].Clear();
                    mustlistele();
                    con.Close();
                    
                }
            }
            catch (Exception ex)
            {
                
            }