payment through paypal in Asp.Net

A simple Way to payment through Paypal..

For this it is compulsory to login in your pay pal account.

Now come to the coding part ..  Take one text-box and a button

 protected void Button1_Click(object sender, EventArgs e)

    {

       protected decimal dec;(take this globally)

        try

        {

            dec = Convert.ToDecimal(TextBox1.Text);

                       

        }

        catch(Exception ex)

        {

            Label1.Visible = true;

        }

        paypalquery();

    }

 protected void paypalquery()

    {

//Make a class named it as "paypal"

        paypal pay = new paypal();

        pay.AccountEmail = paypal.Email;

        pay.PayPalBaseUrl = paypal.PayPalUrl;

        pay.Amount = dec;

        pay.ItemName = "New Item Added";

        pay.SuccessUrl = Request.Url + "?paypal=success";

        pay.CancelUrl = Request.Url + "?paypal=cancel";

        Response.Redirect(pay.submiturl());

        return;

    }

this is cs class

public class paypal

{

    public string LogoUrl = "";

    public string AccountEmail = "";

    public string BuyerEmail = "";

    public string SuccessUrl = "";

    public string CancelUrl = "";

    public string ItemName = "";

    public decimal Amount = 0.00M;

    public string InvoiceNo = "";

    public static string Email = "PayPalEmailAccount@YourCompany.com";

    public static string PayPalUrl = "https://www.sandbox.paypal.com/us/cgi-bin/webscr?";

    public string PayPalBaseUrl = "https://www.paypal.com/cgi-bin/webscr?";

public paypal()

{

//

// TODO: Add constructor logic here

//

}

    public string submiturl()

    {

        StringBuilder buil = new StringBuilder();

        buil.Append(PayPalBaseUrl + "cmd=_xclick&business=" + HttpUtility.UrlEncode(AccountEmail));

       if (Amount != null)

           buil.AppendFormat("&amount={0:f2}", Amount);

       if (ItemName != null && ItemName != "")

           buil.AppendFormat("&item_name={0}", HttpUtility.UrlEncode(ItemName));

       if (SuccessUrl != null && SuccessUrl != "")

           buil.AppendFormat("&return={0}", HttpUtility.UrlEncode(SuccessUrl));

       if (CancelUrl != null && CancelUrl != "")

           buil.AppendFormat("&cancel_return={0}", HttpUtility.UrlEncode(CancelUrl));

        return buil.ToString();

    }

    public class configuration

    {

        public static string email = "PayPalEmailAccount@YourCompany.com";

        public static string PayPalUrl = "https://www.sandbox.paypal.com/us/cgi-bin/webscr?";

    }

}