C#與SQL

登錄測試

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CLearning
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("輸入用戶名");
            string username = Console.ReadLine();
            Console.WriteLine("輸入密碼");
            string password = Console.ReadLine();
            Console.WriteLine(password);
            using (SqlConnection conn = new SqlConnection(@"server=.\;database=mydb2;Trusted_Connection=SSPI;"))
            { 
                conn.Open(); 
                using(SqlCommand cmd=conn.CreateCommand())
                {
                    cmd.CommandText = "select * from Table_1 where Username ='"+username+"'";
                    using(SqlDataReader reader=cmd.ExecuteReader())
                    {
                        if (reader.Read())
                        {
                            string dbpasseord = reader.GetString(reader.GetOrdinal("Password"));
                            Console.WriteLine("dbpassword=" + dbpasseord);
                            if (password == dbpasseord)
                            {
                                Console.WriteLine("Succeed");
                            }
                            else Console.WriteLine("Password Error");
                        }
                        else
                        {
                            Console.WriteLine("no username");
                        }
                    }
                }
            }
        }
    }
}