How to link a button to outlook application and send mail c#

Question

protected void LinkButton1_Click(object sender, EventArgs e) {
    string ContactID = txtContactID.Text; 
    string EmailMessage = txtEmailContent.Text; 
    string[] words = ContactID.Split(',');
    foreach (string word in words)
    {
        DataTable dt = reference.SendMultipleEmail_Fetch(Convert.ToInt32(words)).Tables[0];

        if (dt.Rows.Count > 0)
        {
            foreach (DataRow row in dt.Rows)
            {
                if (row["Email"].ToString() != "" && txtContactID.Text != "" && txtEmailContent.Text != "")
                {    
                    Process.Start("mailto:" + row["Email"].ToString() + "?subject=" + "I love you" + "&body=" + "Hi you");
                    lblInfo.Text = "Message successfully sent"; 
                }
                else
                {
                    lblInfo.Text = "Email Content is required or contact not selected";
                    return;
                }
            }
        }
    }

I have a grid table which multiple email addresses can be checked and mailed as a group. am trying to add a link button that will open up outlook and populate with the email addresses checked on the grid and then send mail out

Answer 1

If you just want to open email client window for sending a message, you can use this:

 Process.Start("mailto:" + emailAddress + "?subject=" + subject + "&body=" + body);

However, if you just want to send email without any input from the user, best bet would be to send directly via SMTP server. You can use SmtpClient class for that: https://msdn.microsoft.com/en-us/library/system.net.mail.smtpclient%28v=vs.110%29.aspx