ตรวจสอบสถานะ Connection

var sqlCon= new SqlConnection(Properties.Settings.Default.sString);
var mySQLCon= new MySqlConnection(Properties.Settings.Default.dString);
sqlCon.Open();
mySQLCon.Open();
var temp = mySQLConn.State.ToString();
if (sqlCon.State==ConnectionState.Open && temp=="Open")
 {
   MessageBox.Show(@"Connection working.");
 }
else
 {
  MessageBox.Show(@"Please check connection string");
 }