Write an ASP.Net program that gets user input such as the user name, mode of payment, and appropriate credit card. After the user enters the appropriate values, the Validation button validates the values entered. 

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Answer:

Default.aspx

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

<!DOCTYPE html>
<html lang="en">
<head runat="server">
    <meta charset="utf-8" />
    <title>Payment Validation</title>
</head>
<body>
    <form id="form1" runat="server">
        <h2>Payment Validation</h2>

        <label for="username">User Name:</label>
        <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox><br /><br />

        <label for="paymentMode">Mode of Payment:</label>
        <asp:DropDownList ID="ddlPaymentMode" runat="server">
            <asp:ListItem Text="Select Mode" Value="0"></asp:ListItem>
            <asp:ListItem Text="Credit Card" Value="1"></asp:ListItem>
            <asp:ListItem Text="Debit Card" Value="2"></asp:ListItem>
            <asp:ListItem Text="PayPal" Value="3"></asp:ListItem>
        </asp:DropDownList><br /><br />

        <label for="creditCard">Credit Card Number:</label>
        <asp:TextBox ID="txtCreditCard" runat="server"></asp:TextBox><br /><br />

        <asp:Button ID="btnValidate" runat="server" Text="Validate" OnClick="btnValidate_Click" /><br /><br />

        <asp:Label ID="lblMessage" runat="server" ForeColor="Red"></asp:Label>
    </form>
</body>
</html>

Default.aspx.cs (Code Behind)

using System;
using System.Text.RegularExpressions;

namespace PaymentValidationExample
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            // No initialization required for this case.
        }

        protected void btnValidate_Click(object sender, EventArgs e)
        {
            string userName = txtUserName.Text.Trim();
            string paymentMode = ddlPaymentMode.SelectedValue;
            string creditCard = txtCreditCard.Text.Trim();

            // Validate User Name
            if (string.IsNullOrEmpty(userName))
            {
                lblMessage.Text = "User Name is required.";
                return;
            }

            // Validate Mode of Payment
            if (paymentMode == "0")
            {
                lblMessage.Text = "Please select a valid mode of payment.";
                return;
            }

            // Validate Credit Card (only for credit card and debit card modes)
            if ((paymentMode == "1" || paymentMode == "2") && !IsValidCreditCard(creditCard))
            {
                lblMessage.Text = "Please enter a valid credit card number.";
                return;
            }

            // If all validations pass
            lblMessage.ForeColor = System.Drawing.Color.Green;
            lblMessage.Text = "Validation Successful!";
        }

        // Basic validation for credit card (must be numeric and 16 digits long)
        private bool IsValidCreditCard(string creditCard)
        {
            Regex regex = new Regex(@"^\d{16}$"); // Match exactly 16 digits
            return regex.IsMatch(creditCard);
        }
    }
}

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