C# simple logging page Desktop application

Please type correctly this .Open   not .open





all is well in your code just change the statement  


            if (con.State == ConnectionState.Closed)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace Login_page_Msaccess
{
    public partial class Form1 : Form
    {
        string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["dsn"];
        OleDbCommand com;
        string str;
       
        object obj = null;
        public Form1()
        {
            InitializeComponent();
        }

        private void btn_login_Click(object sender, EventArgs e)
        {

            OleDbConnection con = new OleDbConnection(ConnectionString);
            con.Open();
            str = "select count(*) from login where UserName=@UserName and Password =@Password";
            com = new OleDbCommand(str, con);
            com.CommandType = CommandType.Text;
            com.Parameters.AddWithValue("@UserName", TextBox_user_name.Text);
            com.Parameters.AddWithValue("@Password", TextBox_password.Text);
            obj = com.ExecuteScalar();
            if ((int)(obj) != 0)
            {
                lb1.Text = "WELLCOME :: " + TextBox_user_name.Text;
            }
            else
            {
                lb1.Text = "invalid user name and password";
            }
            con.Close();
        }
       
    }
}

Hello Friend,
                Replace the con.open() with the following.

        con.Open();


and i think the better approach for adding parameter to SqlCommand class is like the following.

cmd.Parameters.AddWithValue("@u",textBox1_username.Text);
cmd.Parameters.AddWithValue("@p", textBox1_passowrd.Text);

Rest all of the things are fine.

Hope that solves your problem.

With Regards,
Vishal Gilbile.