Preview:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace smtp1
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            try
            {
                // Create the email
                MailMessage mail = new MailMessage();
                mail.To.Add(TextBox1.Text);  // Recipient email (from input)
                mail.From = new MailAddress("helloeventplanner2025@gmail.com");
                mail.Subject = TextBox2.Text; // Subject from input
                mail.Body = TextBox3.Text;    // Body from input

                // Configure SMTP
                SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
                smtp.Credentials = new System.Net.NetworkCredential(
                    "helloeventplanner2025@gmail.com",
                    "lmrpnnsvmdlhexxp" // Gmail App Password
                );
                smtp.EnableSsl = true;

                // Send email
                smtp.Send(mail);

                Label1.Text = "✅ Email sent successfully!";
            }
            catch (Exception ex)
            {
                Label1.Text = "❌ Error: " + ex.Message;
            }
        }
    }
}












<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="smtp1.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            To&nbsp;&nbsp;
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            <br />
            Sub
            <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
            <br />
            Body
            <asp:TextBox ID="TextBox3" runat="server" Height="129px" Width="255px"></asp:TextBox>
            <br />
            <br />
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Send" />
        </div>
        <asp:Label ID="Label1" runat="server" Text="Status"></asp:Label>
    </form>
</body>
</html>
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