Public Sub SendMail(ByVal EmailFrom As String, ByVal FromName As String, ByVal ToName As String, ByVal EmailTo As String, ByVal MailSubject As String, ByVal MailBody As String, ByVal Bcc As Int32)
    Try
        Dim mail As New MailMessage()
        Dim smtp As New SmtpClient()
        mail.From = New MailAddress(EmailFrom, FromName)
        mail.To.Add(EmailTo)
        mail.Subject = MailSubject
        mail.Body = MailBody

        mail.IsBodyHtml = True
        smtp.Host = "smtp.gmail.com"
        smtp.Credentials = New System.Net.NetworkCredential("example@gmail.com","abc")
        smtp.Send(mail)
    Catch ex As Exception
    End Try
End Sub![enter image description here][1]

mail.To.Add(new MailAddress(EmailTo, ToName));

Are you using ASp.NET Membership?? If so, you can try this

using System.Web.Security;

MembershipUser user = Membership.GetUser(HttpContext.Current.User.Identity.Name);

if (user != null)
{
    string username = user.UserName;
    //set your label text here
}