C#

<pre lang="c#"><pre>using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace GridView
{
    public partial class practise : System.Web.UI.Page
    {
       public static List<User> listuser = new List<User>()
       {
                new User() {ID = 1, UserName = "Dhruv", Password = "hello"},
                new User() {ID = 2, UserName = "Gaurav", Password = "12345"},
                new User() {ID = 3, UserName = "Rahul", Password = "asdfg"},
                new User() {ID = 4, UserName = "Guru", Password = "qwerty"}
       };

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                listuser = new List<User>();
                GRIDDATA.DataSource = listuser;
                GRIDDATA.DataBind();
            }
        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            User data = new User();
            data.UserName = TextBox1.Text;
            data.Password = TextBox2.Text;
            //listuser.Add(data);

            bool UserExists(string userName, string password)
            {
                return listuser.Any(a => a.UserName.Equals(userName, StringComparison.CurrentCultureIgnoreCase) && a.Password.Equals(password));
            }

            if(UserExists(data.UserName, data.Password))
            {
                
                Response.Redirect("https://www.googel.com");
            }
        }
    }


    public class User
    {   
        public int ID { get; set; }
        public string UserName { get; set; }
        public string Password { get; set; }   
    }
}