student_login.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public partial class student_login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        Session["id"] = txtUserName.Text;
        SqlConnection con = new SqlConnection("Data Source=AKKI-PC\\SATYAMMSSQL;Initial Catalog=CIS;Integrated Security=True");
        con.Open();
        SqlCommand cmd = new SqlCommand("select * from student where studentid =@studentid and pass=@pass", con);
        cmd.Parameters.AddWithValue("@studentid", txtUserName.Text);
        cmd.Parameters.AddWithValue("@pass", txtPWD.Text);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        if (dt.Rows.Count > 0)
        {
            Response.Redirect("student_home.aspx");
        }
        else
        {
            ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Invalid Username and Password')</script>");
        }
    }

    protected void Page_Init(object sender, EventArgs e)
    {
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.Cache.SetExpires(DateTime.Now.AddSeconds(-1));
        Response.Cache.SetNoStore();
    }
}