==>>First you need have to design the aspx page like :---
<div>
<table align="center">
<tr>
<td colspan="2" align="center">
<b>Send Mail using C# Asp.Net</b>
</td>
</tr>
<tr>
<td>
Gmail ID:
</td>
<td>
<asp:TextBox ID="txtUserEmail" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
Gmail Password:
</td>
<td>
<asp:TextBox ID="txtPassword" runat="server" TextMode="Password"></asp:TextBox>
</td>
</tr>
<tr>
<td>
Subject:
</td>
<td>
<asp:TextBox ID="txtSubjectText" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
To:
</td>
<td>
<asp:TextBox ID="txtToEmail" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td valign="top">
Body:
</td>
<td>
<asp:TextBox ID="txtBodyPart" runat="server" TextMode="MultiLine" ></asp:TextBox>
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:Button ID="btnSend" Text="Send" runat="server" onclick="btnSend_Click" />
</td>
</tr>
</table>
</div>
==>>Secound you need have to write the the code on aspx.cs page on BtnSend Click event :---
protected void btnSend_Click(object sender, EventArgs e)
{
try
{
MailMessage Msg = new MailMessage();
Msg.From = new MailAddress(txtUserEmail .Text);
Msg.To.Add(txtToEmail.Text);
Msg.Subject = txtSubjectText.Text;
Msg.Body = txtBodyPart.Text;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.Port = 587;
smtp.Credentials = new System.Net.NetworkCredential(txtUserEmail .Text, txtPassword .Text);
smtp.EnableSsl = true;
smtp.Send(Msg);
Msg = null;
Page.RegisterStartupScript("Message", "<script>alert('E-Mail Successfully Send...');if(alert){ window.location='Default.aspx';}</script>");
}
catch (Exception ex)
{
}
}
Note:-You need to add this namespace in .cs file>>
using System.Net.Mail;
Hope this will help you
