Create an ASP.Net application that accepts name, password, age, email ID, and user ID. All the information entries are compulsory. The password should be reconfirmed. Age should be within 21 to 30. Email ID should be valid. User ID should have at least one capital letter, one digit, and its length should be between 7 and 20 characters.

Answer:

Default.aspx:

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="validationinasp._Default" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
    <main>
        <table style="width: 66%;">
            <tr>
                <td class="style1" colspan="3" align="center">
                    <asp:Label ID="lblmsg" Text="Registration Form" runat="server" />
                </td>
            </tr>

            <tr>
                <td class="style3">Candidate:</td>
                <td class="style2">
                    <asp:DropDownList ID="ddlcandidate" runat="server" style="width:239px">
                        <asp:ListItem>Please Choose a Candidate</asp:ListItem>
                        <asp:ListItem>M H Kabir</asp:ListItem>
                        <asp:ListItem>Steve Taylor</asp:ListItem>
                        <asp:ListItem>John Abraham</asp:ListItem>
                        <asp:ListItem>Venus Williams</asp:ListItem>
                    </asp:DropDownList>
                </td>
                <td></td>
            </tr>

            <tr>
                <td class="style3">Email:</td>
                <td class="style2">
                    <asp:TextBox ID="txtemail" runat="server" style="width:250px"></asp:TextBox>
                </td>
                <td></td>
            </tr>

            <tr>
                <td class="style3">Password:</td>
                <td class="style2">
                    <asp:TextBox ID="TextBox2" runat="server" TextMode="Password"></asp:TextBox>
                </td>
                <td></td>
            </tr>

            <tr>
                <td class="style3">Confirm Password:</td>
                <td class="style2">
                    <asp:TextBox ID="TextBox3" runat="server" TextMode="Password"></asp:TextBox>
                </td>
                <td></td>
            </tr>

            <tr>
                <td class="style3">User ID:</td>
                <td class="style2">
                    <asp:TextBox ID="txtUserID" runat="server" style="width:250px"></asp:TextBox>
                </td>
                <td></td>
            </tr>

            <tr>
                <td class="style3">Name:</td>
                <td class="style2">
                    <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
                </td>
                <td></td>
            </tr>

            <tr>
                <td class="style3">Age:</td>
                <td class="style2">
                    <asp:TextBox ID="txtAge" runat="server"></asp:TextBox>
                </td>
                <td></td>
            </tr>

            <tr>
                <td class="style3" align="center" colspan="3">
                    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Register" />
                </td>
            </tr>
        </table>
    </main>
</asp:Content>

Default.aspx.cs:

using System;
using System.Web.UI;

namespace validationinasp
{
    public partial class _Default : Page
    {
        protected void Button1_Click(object sender, EventArgs e)
        {
            string name = TextBox4.Text;
            string userId = txtUserID.Text;
            string email = txtemail.Text;
            string password = TextBox2.Text;
            string confirmPassword = TextBox3.Text;
            string age = txtAge.Text;
            string candidate = ddlcandidate.SelectedValue;

            if (password == confirmPassword)
            {
                lblmsg.Text = "Registration successful!";
            }
            else
            {
                lblmsg.Text = "Passwords do not match.";
            }
        }
    }
}