login

.cs :-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

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

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        int result;
        WebMethod.WebService x = new WebMethod.WebService();
        result = x.auth(TextBox1.Text, TextBox2.Text);
        if(result==1)
            Server.Transfer("Bill.aspx", true);
        else
            Server.Transfer("Unauthorized.aspx", true);

    }
}

.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        Welcome to Billing System.<br />
        Enter your username and password :-<br />
        Username :
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <br />
        Password:<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <br />
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" />

    </div>
    </form>
</body>
</html>