using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.Data.OleDb;


namespace LoginForms
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

private string GenerateHash(string SourceText)

        {
            UnicodeEncoding Ue = new UnicodeEncoding();
            byte[] ByteSourceText = Ue.GetBytes(SourceText);
            MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
            byte[] ByteHash = MD5.ComputeHash(ByteSourceText);
            return Convert.ToBase64String(ByteHash);
      }

private void GetUsername(ref string UsernameFromDatabse, ref string CorrectPassword, string Username)

        {
            clsDBConnector dbConnector = new clsDBConnector();
            OleDbDataReader dr;
            string sqlStr;
            dbConnector.Connect();
           sqlStr = "SELECT        Username, [Password]" +
                  " FROM            Login" +
                  " WHERE        Username = '" + Username  +"'";
            dr = dbConnector.DoSQL(sqlStr);
            while (dr.Read())
            {
                UsernameFromDatabse = Convert.ToString(dr[0]);
                CorrectPassword = Convert.ToString(dr[1]);
            }
      }


        private void button1_Click(object sender, EventArgs e)
        {

string Username = "", GuessedPasswordHashed = "", CorrectPassword = "", UsernameFromDatabse = "";

            Username = txt_Username.Text;
            GuessedPasswordHashed = GenerateHash(txt_Password.Text);
            GetUsername(ref UsernameFromDatabse,ref CorrectPassword, Username);
            if (GuessedPasswordHashed == CorrectPassword)
            {
                    Logged_In frm = new Logged_In();
                    frm.Show();

      }

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }
    }
}