Sending E-Mail by C#.NET, Simple steps

Step 1 : Design Preparation.

we need the following design in windows application project.

the above forms for SMTP Configuration form and Sending Mail form.

Step 2 : Add the SMTP configuration class

add the following class in you project in order to make a SMTP configuration for your mail that we need to send.

public class cls_smtpConfiguration 

    {

        public static string host;

        public static int port;

        public static int timeout;

        public static bool enable_ssl;

        public static string username_account;

        public static string password_account;

    }

this class has a values from SMTP Configuration form and will get it for Sending Mail form.


Step 3 : In the SMTP Configuration form
Add the following code in the button Save Setting in the SMTP Configuration form

            cls_smtpConfiguration.host = textBox1.Text;
            cls_smtpConfiguration.port = Convert.ToInt32(textBox2.Text);
            cls_smtpConfiguration.timeout = Convert.ToInt32(textBox4.Text);
            if (radioButton1.Checked == true)
            {
                cls_smtpConfiguration.enable_ssl = true;
            }
            else 
            {
                cls_smtpConfiguration.enable_ssl = false;
            }
            cls_smtpConfiguration.username_account = textBox6.Text;
            cls_smtpConfiguration.password_account = textBox5.Text;
            this.Close();


The above code try to setting values from controls of form to members of cls_smtpConfiguration Class

Step 4 : In the Sending Mail form
follow the following steps under the Send mail button

• Define the following line

1. System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
2. System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient(cls_smtpConfiguration.host, cls_smtpConfiguration.port);
3. System.Net.Mail.Attachment attach;

message object : for setting values (from, to, body ....)

smtp object : for setting smtp configuration about from mail

attach object : for setting the attachement files that is required to be attached with mail .

• Try to validate [mail from] and [mail to]
if (ValidateEmail(textBox2.Text) == true) { message.To.Add(textBox2.Text); } else { MessageBox.Show("not valid mail");return; }

if (ValidateEmail(textBox1.Text) == true) {message.From = new System.Net.Mail.MailAddress(textBox1.Text); } else { MessageBox.Show("not valid mail"); return; }

• Setting the following values

1. message.Subject = textBox3.Text;
2. message.Body = richTextBox1.Text;
3. smtp.Timeout = cls_smtpConfiguration.timeout;
4. smtp.EnableSsl = cls_smtpConfiguration.enable_ssl;
5. smtp.Credentials = new System.Net.NetworkCredential(cls_smtpConfiguration.username_account, cls_smtpConfiguration.password_account);

• the following code for setting [attach] object all attachement that is exist in listbox1
if (listBox1.Items.Count > 0) { for (int i = 0; i < listBox1.Items.Count; i++) { attach = new System.Net.Mail.Attachment(listBox1.Items[i].ToString()); message.Attachments.Add(attach); } }
• Final Step, sending mail
smtp.Send(message); MessageBox.Show("message sended !!");

follow the following steps under the SMTP configure button

Form2 x = new Form2();
x.ShowDialog();

follow the following steps under the Select button

OpenFileDialog x = new OpenFileDialog();
x.ShowDialog();
listBox1.Items.Add(x.FileName);

How to validate E-mail by C#, Simple Steps

Step 1: type the following reference in above your class form

using System.Text.RegularExpressions;

Step 2: Insert the following method in your application.


 public bool ValidateEmail(string sEmail)
        {
            Regex exp = new Regex(@"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");
            Match m = exp.Match(sEmail);
            if (m.Success && m.Value.Equals(sEmail))
            {
                return true;
            }
            else 
            {
                return false;
            }
        }


Step 3 : Call above method in any pace you want .

if (ValidateEmail(textBox2.Text) == true)
    {
         MessageBox.Show("valid mail");
     }
else { MessageBox.Show("not valid mail"); }