Login.aspx nogen er kan hæjlpe

Jeg skal lave en login side, hvor man skriver sin email og et password..

Databasen er lavet hvor Login.aspx siden så skal tjekke om mail og password passer sammen men hvordan jeg gør det ved jeg ikke..

Min c# kode er:

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace SKiste
{
    /// <summary>
    /// Summary description for Login.
    /// </summary>
    public class Login : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Button bnLogin;
        protected System.Web.UI.WebControls.TextBox tbUserName;
        protected System.Web.UI.WebControls.TextBox tbPassword;
        protected System.Web.UI.WebControls.Label Label1;
        protected System.Web.UI.WebControls.Button bnCreateUser;
   
        private void Page_Load(object sender, System.EventArgs e)
        {
            // Put user code to initialize the page here
        }
        //Redirect page after login succeed
       


        #region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }
       
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {   
            this.bnLogin.Click += new System.EventHandler(this.bnLogin_Click);
            this.bnCreateUser.Click += new System.EventHandler(this.bnCreateUser_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void bnCreateUser_Click(object sender, System.EventArgs e)
        {
            //Sender bruger videre til siden for at kunne oprette brugeren
            Response.Redirect("CreateUSer.aspx");
        }

        private void bnLogin_Click(object sender, System.EventArgs e)
        {
           
       
       
       

        }
    }
}