C ＃ learning notes ----- C ＃ connect to MySQL database

using System.Linq;
using System.Text;
using System.Data;//  Namespace of reference table 
using System.Data.SqlClient;


namespace ConnectMySQL
{
    
    internal class Program
    {
    
        static void Main(string[] args)
        {
    
            Console.WriteLine(" Enter the student id ：");

            // First step , Declare a connected object string 
            // Connect to database 
            SqlConnectionStringBuilder scsb = new SqlConnectionStringBuilder();

            scsb.DataSource = "127.0.0.1";   // Address 
            scsb.UserID = "bigEric"; //  Account name 
            scsb.Password = "123456";// The login password 
            scsb.InitialCatalog = "table1";// Table name 

            SqlConnection sqlCon = new SqlConnection(scsb.ToString());
            // Judge whether the connection has been opened 
            if (sqlCon.State==ConnectionState.Closed)
            {
    
                sqlCon.Open();
            }
            string stu_no = Console.ReadLine();

            // To be used SQL sentence  
            string sqlStr = "SELECT * FROM students WHERE  Student number = '" + stu_no + "'";

            // establish SQL Execution of statements 
            SqlCommand sqlCommand =new SqlCommand(sqlStr,sqlCon);
            SqlDataReader sdr = null;

            try
            {
    
                sdr = sqlCommand.ExecuteReader();
                while (sdr.Read())
                {
    
                    Console.WriteLine(" full name ：" + sdr[" full name "].ToString());
                    Console.WriteLine(" class ：" + sdr[" class "].ToString());
                    Console.WriteLine(" Gender ：" + sdr[" Gender "].ToString());
                    Console.WriteLine(" Age ：" + sdr[" Age "].ToString());
                    Console.WriteLine("----------------");
                }

            }
            catch (Exception ex)
            {
    
                Console.WriteLine(ex.Message);
                throw;
            }
            // Finally, remember to close the database 
            finally
            {
    
                sqlCon.Close();
            }



        }
    }
}