[C#] 連結MySQL語法

using MySql.Data.MySqlClient;//安裝MySql.Data.msi套件，再引用參考

//資料庫位址,帳號,密碼,資料庫名稱,存取編碼
MySqlConnection myConnection = new MySqlConnection("server=localhost;user id=root; password=sa123; database=mer; CharSet=utf8");

MySqlDataReader sqlDataReader;
MySqlCommand sqlCmd;

myConnection.Open();

string sql = string.Format("SELECT * FROM health_care where Account_number ='{0}' and Password = '{1}'",id_textBox.Text,pass_textBox.Text);
sqlCmd = new MySqlCommand(sql, myConnection);
sqlDataReader = sqlCmd.ExecuteReader();

if (sqlDataReader.Read())
{
   string 變數 = MaxCodeSqlData["資料表名稱"].ToString();
}
sqlDataReader.Close();
myConnection.Close();