[RESOLVED] Multiple upload is blocked at 2 pictures

Hi,
I'm making a program in order to upload images in Imagevenue etc...
Send pictures or receive results (http address), there is no problem.
But I want multithreading for this application.
In beginning, I used threadpool with variable "maxthreads". But I didn't
upload more 2 pictures at the same time. I tried 3 pictures at the same time,
but it's always 2 pictures which are uploading...

So, I decided to try with backgroundworker. But it's always the same problem.
The thirst backgrounworker is brake...
How can I upload more 2 images at the same time ?


It's my exemple with backgroundworker

Code:

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Imports System.Threading
Imports System.Text
Imports System.IO
Imports System.Net

Public Class Form1

    ' My 3 images
    Dim filepath1 As String = "C:\test\A.jpg"
    Dim filepath2 As String = "C:\test\B.jpg"
    Dim filepath3 As String = "C:\test\C.jpg"

    ' My 3 results
    Dim result1 As String = ""
    Dim result2 As String = ""
    Dim result3 As String = ""
 
    ' my first backgroundworker for first upload
    Private Sub bgw1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgw1.DoWork
        Dim boundary As String = ("----------" & DateTime.Now.Ticks.ToString("x"))
        Dim Postheader() As Byte

        Dim builder As New StringBuilder
        builder.Append("--")
        builder.Append(boundary)
        builder.Append(ChrW(13) & ChrW(10))
        builder.Append("Content-Disposition: form-data; name=""imgcontent""")
        builder.Append(ChrW(13) & ChrW(10))
        builder.Append(ChrW(13) & ChrW(10))
        builder.Append("Not safe for work")
        builder.Append(ChrW(13) & ChrW(10))
        builder.Append("--")
        builder.Append(boundary)
        builder.Append(ChrW(13) & ChrW(10))
        builder.Append("Content-Disposition: form-data; name=""userfile[]""; filename=""")
        builder.Append(Path.GetFileName(filepath1))
        builder.Append("""")
        builder.Append(ChrW(13) & ChrW(10))
        builder.Append("Content-Type: ")
        builder.Append("image/jpeg")
        builder.Append(ChrW(13) & ChrW(10))
        builder.Append(ChrW(13) & ChrW(10))
        Postheader = Encoding.UTF8.GetBytes(builder.ToString)

        Dim myStream As FileStream = Nothing
        Dim requestStream As Stream = Nothing
        Dim myResponse As HttpWebResponse = Nothing
        Dim myReader As StreamReader = Nothing

        Try
            Dim myRequest As HttpWebRequest = DirectCast(WebRequest.Create("http://www.imagevenue.com/upload.php"), HttpWebRequest)
            myRequest.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.0; ru; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6"
            myRequest.ContentType = ("multipart/form-data; boundary=" & boundary)
            myRequest.KeepAlive = False
            myRequest.ServicePoint.Expect100Continue = True
            myRequest.Method = "POST"
            myRequest.AllowWriteStreamBuffering = False
            Dim bytes As Byte() = Encoding.ASCII.GetBytes((ChrW(13) & ChrW(10) & "--" & boundary & "--" & ChrW(13) & ChrW(10)))

            myStream = New FileStream(filepath1, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)

            Dim taille As Long = ((Postheader.Length + myStream.Length) + bytes.Length)
            myRequest.ContentLength = taille
            requestStream = myRequest.GetRequestStream

            ' Send first information before image
            requestStream.Write(Postheader, 0, Postheader.Length)

            Const BufferSize As Integer = 4096
            Dim content As Byte() = New Byte(BufferSize - 1) {}
            Dim dataRead As Integer
            Dim dataReads As Long = 0

            ' Send image
            While True
                dataRead = myStream.Read(content, 0, BufferSize)
                If dataRead = 0 Then
                    Exit While
                End If
                requestStream.Write(content, 0, dataRead)
                dataReads += dataRead
                bgw1.ReportProgress(Math.Round(CDbl((dataReads / myStream.Length) * 100), 0))
            End While

            ' Send info after image
            requestStream.Write(bytes, 0, bytes.Length)

            requestStream.Close()
            requestStream.Dispose()
            myStream.Close()
            myStream.Dispose()
            myResponse = DirectCast(myRequest.GetResponse, HttpWebResponse)
            myReader = New StreamReader(myResponse.GetResponseStream, Encoding.UTF8)
            Dim myResult As String = myReader.ReadToEnd
            myResponse.Close()
            myReader.Close()
            myReader.Dispose()

            If myResult.Contains("successfully") Then
                If (myResult.Contains("[URL=http://") AndAlso myResult.Contains("[/URL]")) Then
                    myResult = myResult.Substring(myResult.IndexOf("[URL=http://"))
                    myResult = myResult.Remove((myResult.IndexOf("[/URL]", 0) + 6))
                ElseIf (myResult.Contains("http://") AndAlso myResult.Contains("")) Then
                    myResult = myResult.Substring(myResult.IndexOf("[IMG]http://"))
                    myResult = myResult.Remove((myResult.IndexOf("[/IMG]", 0) + 6))
                End If

                result1 = myResult
            End If

        Catch exception As Exception

        Finally
            Try
                If (Not requestStream Is Nothing) Then
                    requestStream.Close()
                    requestStream.Dispose()
                End If
                If (Not myStream Is Nothing) Then
                    myStream.Close()
                    myStream.Dispose()
                End If
                If (Not myResponse Is Nothing) Then
                    myResponse.Close()
                    myResponse = Nothing
                End If
                If (Not myReader Is Nothing) Then
                    myReader.Close()
                    myReader.Dispose()
                End If

            Catch 'obj2 As Object
            End Try
        End Try
     
    End Sub

Private Sub bgw2_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgw2.DoWork
     
' Same of first backgroundworker, but for 2nd image

    End Sub

    Private Sub bgw3_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgw3.DoWork
       
' Same of first backgroundworker, but for 3rd image

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ' launch 3 backgroundworker     

        bgw1.RunWorkerAsync()
        bgw2.RunWorkerAsync()
        bgw3.RunWorkerAsync()
    End Sub

    ' update of progressbars
    Private Sub bgw1_ProgressChanged(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles bgw1.ProgressChanged
        ProgressBar1.Value = e.ProgressPercentage
    End Sub

    Private Sub bgw2_ProgressChanged(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles bgw2.ProgressChanged
        ProgressBar2.Value = e.ProgressPercentage
    End Sub

    Private Sub bgw3_ProgressChanged(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles bgw3.ProgressChanged
        ProgressBar3.Value = e.ProgressPercentage
    End Sub

End Class

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Sorry for my bad english.
Bye

maybe webhost doesn't allow more than 2 connections from same ip and thread pool owns better than making same method 3 times

Imagevenue allow more than 2 connections. I tried with another software which works.
Threadpool have the same result than backgroundworker : 2 upload max

Sorry, the other software was bad.
vb2dub you're right, the server accept only 2 connections.
I saw the connections open in netstat, and there are 2 connections open max.

Thank you.