Как отправить изображение с помощью метода web api для разъединения с клиентской машины.

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Привет
У меня есть метод в моем веб - api,который принимает 4 параметра as-stream,string,int, long

как вызвать метод webapi POST из клиента .
я пробовал классы webclinet или webrequest
но я получаю ошибку 404-файл не найден всякий раз, когда пытаюсь выполнить

wc.UploadData(URL, "POST", byteData) 
or 
 Dim response As HttpWebResponse = request.GetResponse()

Любое предложение будет высоко оценено .

Что я уже пробовал:

<pre>

Imports System
Imports System.Text
Imports System.Collections
Imports System.Collections.Generic
Imports System.Data
Imports System.Net
Imports System.Net.Security
Imports System.IO
Imports System.Net.HttpListener
Imports System.Net.Http.Headers
Imports System.Security.Cryptography
Imports System.Security
Imports System.Web

Module Module1

    Function CertificateValidationCallBack( _
ByVal sender As Object, _
ByVal certificate As X509Certificates.X509Certificate, _
ByVal chain As X509Certificates.X509Chain, _
ByVal sslPolicyErrors As SslPolicyErrors _
) As Boolean

        Return True
    End Function

    Sub Main()
        
        Dim fileData As Byte() = File.ReadAllBytes("D:\pic.jpg")
        Dim URL As String = "MY_URL"
        Dim imgstream As Stream = New MemoryStream(fileData)
        Dim reader As StreamReader = New StreamReader(imgstream)
        Dim text As String = reader.ReadToEnd()
        Dim request As HttpWebRequest = WebRequest.Create(URL)
        Dim wc As WebClient = New WebClient()
        Dim BasicAuth As String = "Basic sdsddsaaa"
        wc.Headers.Add("Authorization", BasicAuth)
        request.Headers.Add("Authorization", BasicAuth)
        ServicePointManager.ServerCertificateValidationCallback = New RemoteCertificateValidationCallback(AddressOf CertificateValidationCallBack)
        request.ContentType = "application/x-www-form-urlencoded"
        request.Method = "POST"       

        Dim data As StringBuilder = New StringBuilder()
        data.Append("stream=" + text)
        data.Append("&filename=" + "pic.jpg")
        data.Append("&ulpMembershipId=" + "1234567")
        data.Append("&mobileNumber=" + "2222222")
        data.Append("&createdBy=" + "aaaaa")
       
        Dim data1 As String = System.Uri.EscapeDataString(data.ToString())
        Dim byteData As Byte() = UTF8Encoding.UTF8.GetBytes(data1.ToString())
        ' Set the content length in the request headers  
        request.ContentLength = byteData.Length
        ' Write data  
        Dim postStream As Stream = request.GetRequestStream()
        postStream.Write(byteData, 0, byteData.Length)
        wc.UploadData(URL, "POST", byteData)
        Dim response As HttpWebResponse = request.GetResponse()
        ' Get the response stream  
        Dim reader1 As StreamReader = New StreamReader(response.GetResponseStream())
        ' Console application output  
        Dim output As String = reader1.ReadToEnd()
    End Sub


End Module

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