Send Mail Using Gmail, Yahoo Account in VB.Net and C#.Net

In this article I am going to show how to send mail from Gmail or Yahoo using VB.Net & C# without logging into your Gmail account.


SMTP Client

  1. Yahoo:
  2. Gmail:


  Imports System.Net


Public Class Form1


    Private Sub Label5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label5.Click


    End Sub


    Private Sub OpenFileDialog1_FileOk(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles OpenFileDialog1.FileOk

        txtatt.Text = OpenFileDialog1.FileName.ToString

    End Sub


    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim str As String = ""

        Dim state As Boolean


        If Microsoft.VisualBasic.Right(txtfrom.Text, 9) = "" Then

            str = ""

            state = True

        ElseIf Microsoft.VisualBasic.Right(txtfrom.Text, 9) = "" Then

            str = ""

            state = False

        End If

        Dim From As Mail.MailAddress = New Mail.MailAddress(txtfrom.Text)

        Dim [To] As Mail.MailAddress = New Mail.MailAddress(txtto.Text)

        Dim Message As Mail.MailMessage = New Mail.MailMessage(From, [To])

        Message.Subject = txtsub.Text

        Message.Body = txtmess.Text

        Message.Attachments.Add(New Mail.Attachment(OpenFileDialog1.FileName.ToString))

        Dim client = New Mail.SmtpClient(str)

        client.EnableSsl = state

        client.Credentials = New System.Net.NetworkCredential(txtfrom.Text, txtpass.Text)


        MsgBox("Send Email Successfully")

    End Sub


End Class

C#.NET Code

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Net;


namespace SendEmailCS


    public partial class Form1 : Form


        public Form1()





         public void Button1_Click(System.Object sender, System.EventArgs e)


              string str="";

            Boolean  state=false;


            if (right (txtfrom .Text ,9)=="")


                 str = "";

                 state =true ;


            else if (right (txtfrom .Text ,9)=="")


                 str = "";

                  state = false ;



            System.Net.Mail.MailAddress From = new System.Net.Mail.MailAddress(txtfrom.Text);

            System.Net.Mail.MailAddress To = new System.Net.Mail.MailAddress(txtto.Text);

            System.Net.Mail.MailMessage Message = new System.Net.Mail.MailMessage(From, To);

            Message.Subject = txtsub.Text;

            Message.Body = txtmess.Text;

            Message.Attachments.Add(new System.Net.Mail.Attachment(openFileDialog1.FileName.ToString()));

            System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient(str);

            client.EnableSsl = Convert .ToBoolean (state );

            client.Credentials = new System.Net.NetworkCredential(txtfrom.Text, txtpass.Text);


            MessageBox.Show("Send Email Successfully");



        public  string right(string param, int length)


            string result = param.Substring(param.Length - length, length);

            return result;



        private void Label5_Click_1(object sender, EventArgs e)





        private void openFileDialog1_FileOk(object sender, CancelEventArgs e)


            txtatt.Text = openFileDialog1.FileName.ToString();





This article helps you to send an Email using a Gmail or Yahoo acount.

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