How do I go about passing either a querystring or variables into my CustomfileUploadStreamProvider?

I see in the docs that UploadHttpRequest as a QueryStrin gattribute, however I only get UploadProvider Information not my querystring

QueryString NameValueCollection Gets the collection of HTTP query string variables.

Web.Config:

    <slickUpload>
        <uploadProfiles>
            <add name="noOverwrite">
                <uploadStreamProvider type="MyCustomFileUploadStreamProvider, App_Code" location="~/Uploaded" QU="" />
            </add>
            <add name="Overwrite">
                <uploadStreamProvider type="MyCustomFileUploadStreamProvider, App_Code" location="~/Uploaded" existingAction="Overwrite"/>
            </add>
        </uploadProfiles>
    </slickUpload>

Here is my Custom Stream:

Imports System
Imports System.IO
Imports System.Web.Configuration
Imports Krystalware.SlickUpload
Imports Krystalware.SlickUpload.Web
Imports Krystalware.SlickUpload.Configuration
Imports Krystalware.SlickUpload.Storage

Public Class MyCustomFileUploadStreamProvider
    Inherits Krystalware.SlickUpload.Storage.FileUploadStreamProvider

    Private _location As String

    Public Sub New(ByVal settings As UploadStreamProviderElement)
        MyBase.New(settings)

        _location = settings.Parameters("location")   
    End Sub

    Public Overrides Function GetWriteStream(ByVal file As Krystalware.SlickUpload.UploadedFile) As System.IO.Stream
        'Return MyBase.GetWriteStream(file)

        file.ServerLocation = GetServerFileName(file)

        Dim imp As Impersonate = New Impersonate()

        If imp.StartImpersonation(WebConfigurationManager.AppSettings("USER"), WebConfigurationManager.AppSettings("DOMAIN"), WebConfigurationManager.AppSettings("PASS")) Then
            Dim fileS As FileStream = Nothing

            Try
                fileS = System.IO.File.OpenWrite(file.ServerLocation)

                Return fileS
            Catch ex As Exception
                If fileS IsNot Nothing Then
                    fileS.Dispose()
                End If

                Return Nothing
            End Try
        End If
        Return Nothing
    End Function

    Public Overrides Function GetServerFileName(ByVal file As UploadedFile) As String
        Dim fileName As String = GenerateFileName(file)

        Return Path.Combine(HttpContext.Current.Server.MapPath(_location), fileName)
    End Function

    Public Function GenerateFileName(ByVal file As UploadedFile) As String
        Dim fileName As String = file.ClientName
        Dim InvalidChars As String() = New String() {"$", "&", "+", ",", "/", ";", _
         ":", "=", "?", "@", "<", ">", _
         "{", "}", "|", "\", "^", "~", _
         "[", "]", "`", " "}

        For Each s As String In InvalidChars
            fileName = fileName.Replace(s, "_")
        Next

        fileName = fileName.Replace("..", ".")
        fileName = fileName.Replace("__", "_")

        Return System.DateTime.Now.ToString("yyyyMMdd_hhmmss_") + fileName
    End Function
End Class

I need to create the new file name based on a Project Number and Version.

It will be on the server side, but it needs the querystring variables to retrieve. 

Thank you Chris.

I just implemented that and it works perfectly.

One more quetion.

In this upload I am using profile "noOverwrite" ( see below ),

1) Even though I have not provided the  < existingAction="Overwrite"/ > attribute, it still overwrites the file.  Is there somewhere else I need to set this so it will NOT overwrite the file.

2) Once I fix the above how do I show the user that the file they are trying to upload exists and it is not overwritten?  Is there a way? 

            <add name="noOverwrite">
                <uploadStreamProvider type="MyCustomFileUploadStreamProvider, App_Code" location="~/Uploaded" />
            </add>