How to consume web-api in winform .NET 2.0 .

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C#

VB

Hi ,
Actually i wanted to invoke some POST method of Web api .
In that post method --- i have to send a file with multiple other parameter

how can i invoke POST method of web api along with other parameter.
in web api ----- its separate -separate 4 parameter with datatype (stream , string , long, long)

What I have tried:

Dim URL As String = strWebApiURL ' "FILE_URL_PATH"
               Dim webClient As WebClient = New WebClient()
               Dim formData As System.Collections.Specialized.NameValueCollection = New System.Collections.Specialized.NameValueCollection()
               formData("filestream") = ""
               formData("filename") = "2"
               formData("ulpMembershipId") = "3"
               formData("mobileNumber") = "4"
               formData("createdBy") = "5"
               formData("idProofType") = "63"
               webClient.Headers.Add("Authorization", BasicAuth)
               Dim responseBytes() As Byte = webClient.UploadValues(URL, "POST", formData)
               Dim Result As String = System.Text.Encoding.UTF8.GetString(responseBytes)