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Posted 13 Mar 2008

Send Email with VB.NET windows application

, 13 Mar 2008
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Send email with attachment using windows app by posting to application

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Send email with attachment using windows app by posting to App

Normally a windows app needs SMTP server to send email. But to setup SMTP server in every client machine is not feasible. With this setup, the emailing will be handled by the web application (as most servers give smtp access) and the windows app will POST email details including attachment to a ASP.NET page and the page can get the values from the controls and send the mail.



Applications cant trust outlook to send email as most people may not configure it, In those case they can use this solution

Using the code

Set up the web app and give its URL in the windows app. I have created a folder named D:\Emailer\ to save the attachment. You might need to change the value for view state if the webserver is returning error. Check the correct value by updoading a file with browser to the web app and logging the request. (Code commented)

"Content-Disposition: form-data; name=""__VIEWSTATE""")"")"/wEPDwULLTIwMjIyMzkxMzQPZBYCAgMPZBYCAgkPFgIeCWlubmVyaHRtbAUBc2RkYtx2BkFJ2ZWs9JmppGZpGmQ0NFY=")

As the web app is using multipart/form-data to receive form values and a file as attachment, the windows app is simulating such a communication to post the data (rfc1867). It will put begin end marking and send the form variables along with the attachement. The app gets the values form the controls in the Load event handler and can use them to send the mail. Find the form variables in page. Please create a folder in D:\Emailer so that the attachment can be saved. The email sending code is omitted as it is very popular.

Dim sURL As String = txtURL.Text
    Dim request As WebRequest = WebRequest.Create(sURL)
    Dim response As WebResponse
    Dim writeStream As Stream
    Dim bytes(0) As Byte

    request.Method = "POST"
    request.Timeout = 20000
    request.ContentType = "multipart/form-data; boundary=---------------------------7d823238a027a"

        request.ContentLength = bytes.Length
        writeStream = request.GetRequestStream()
        writeStream.Write(bytes, 0, bytes.Length)
    Catch ex As Exception
        If Not writeStream Is Nothing Then writeStream.Close()
        MessageBox.Show(ex.Message + " : " + ex.StackTrace)
    End Try

        response = request.GetResponse()
    Catch ex As Exception
        MessageBox.Show(ex.Message + " : " + ex.StackTrace)
    End Try

    Dim sr As StreamReader = New StreamReader(response.GetResponseStream())
    txtResponse.Text = sr.ReadToEnd()

You can see the actual communication if you could log the request in page

Points of Interest

The annoying thing is to post correct data so that the page can receive it


Keep a running update of any changes or improvements you've made here.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer
India India
.Net dev for last 3 years wanting to learn more!

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Comments and Discussions

GeneralVB.NET windows application Pin
mona200916-Dec-09 4:01
membermona200916-Dec-09 4:01 

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