Form1.cs

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.Data.OleDb;
namespace Login
{
    public partial class Form1 : Form
    {
        OleDbConnection con;
        OleDbCommand cmd;
        OleDbDataReader dr;


        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged_1(object sender, EventArgs e)
        {

        }

        private void label4_Click(object sender, EventArgs e)
        {

        }

        private void label5_Click(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {

        }

        private void label2_Click_1(object sender, EventArgs e)
        {

        }

        private void label3_Click(object sender, EventArgs e)
        {

        }

        private void label4_Click_1(object sender, EventArgs e)
        {

        }

        private void button2_Click_1(object sender, EventArgs e)
        {
            this.Close();
        }

        private void label5_Click_1(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged_2(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged_1(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            string username = txt_Username.Text;
            string password = txt_Password.Text;
            if((username == "") || (password == ""))
            {
                MessageBox.Show("Please enter username or password");
            }
            else
            {
                con = new OleDbConnection("Provider =Microsoft.ACE.oledb.12.0; Data Source = dbsoftware.accdb");
                cmd = new OleDbCommand();
                con.Open();
                cmd.Connection = con;
                cmd.CommandText = "SELECT * FROM tblUser WHERE user= '" + username + "' AND pass = '" + password + "'";
                dr = cmd.ExecuteReader();
                if(dr.Read() == true)
  
                {
                    welcome wc = new welcome(username);
                    wc.ShowDialog();
                }
                else
                {
                    MessageBox.Show("Login Denied");
                }

            }
        }
    }
}