Hello experts,
I've been already working on a project and also asked and i've managed
to create a basic Gmail mail sender, but i want to add a progressbar
that shows "sending is in progress" but when i add the
progressbar1.show() when sending then progressbar.hide() after sending
finishes, as known well progressbar is shown after sending is finished
because the main form is in use.

So, must i add multi-threading function to show my progress bar at the
same while my mail is sending simultaneously? Where can i add the code
of that code?

Thanks:

Imports System.Net.mail
Public Class Form1
   Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As
System.EventArgs) Handles btnSubmit.Click
Try

    Dim message As New MailMessage(txtfrom.Text, txtto.Text,
txtsubject.Text, txtbody.Text)
    Dim emailClient As New SmtpClient("smtp.gmail.com")
    message.Priority = MailPriority.High

Dim SMTPUserInfo As New System.Net.NetworkCredential(txtSMTPUser.Text
+ "@gmail.com",
txtSMTPPass.Text)
           emailClient.UseDefaultCredentials = False
           emailClient.Credentials = SMTPUserInfo
           emailClient.Port = 587
           emailClient.EnableSsl = True
           emailClient.Send(message)

           MsgBox("Mail was sent successfully",
MsgBoxStyle.Information, "Success!")
       Catch ex As Exception
           MsgBox("Mail couldn't be send" + vbNewLine + "Make sure
you entered correct username/password then try again later",
MsgBoxStyle.Exclamation, "Fail")
       End Try

   End Sub

End Class