ASP.NET Access to folders and files at client side

I have 2 questions here:

1. Is it possible to write a web application, while user specify a file / a directory, and the web application can loop folder the directory and list out all files within that folder?
2. Assume I get point 1 acheived, is it possible for me to upload all files in that folder to server?

I have the following code. It works fine at my computer (I hosted it here), but access denied when the actual user tested it.

TASK 1.
===========================================================================
        Dim ds() As Integer
        Dim dirInfo As DirectoryInfo
        Dim files() As FileInfo
        Dim i As Integer
        Dim myFile As String
 
        If (fulFileField.HasFile) Then
            Try
                myFile = fulFileField.PostedFile.FileName
                myDir = System.IO.Path.GetDirectoryName(myFile)
                ViewState("myFile") = myDir
                If (optSingleFile.Checked) Then
                    ReDim ds(0)
                    gvwUploadFiles.DataSource = ds
                    gvwUploadFiles.DataBind()
                    DirectCast(gvwUploadFiles.Rows(0).FindControl("HLinkFile"), Label).Text = System.IO.Path.GetFileName(myFile)
                ElseIf (optMultiFile.Checked) Then
                    dirInfo = New DirectoryInfo(myDir)
                    files = dirInfo.GetFiles
                    ReDim ds(files.Length - 1)
                    gvwUploadFiles.DataSource = ds
                    gvwUploadFiles.DataBind()
                    For i = 0 To files.Length - 1
                        myFile = files(i).FullName
                        DirectCast(gvwUploadFiles.Rows(i).FindControl("HLinkFile"), Label).Text = System.IO.Path.GetFileName(myFile)
                        'DirectCast(gvwUploadFiles.Rows(i).FindControl("HLinkFile"), Label).Text = "<a href=""" & myFile & """>" & System.IO.Path.GetFileName(myFile) & "</a>"
                        'DirectCast(gvwUploadFiles.Rows(i).FindControl("HLinkFile"), HyperLink).NavigateUrl = myFile 'Server.UrlDecode(myFile)
                    Next i
                End If
                cmdDisplay.Visible = False
                cmdUpload.Visible = True
                span1.InnerHtml = "Tag the files."
            Catch ex As Exception
                'span1.InnerHtml = "Error: " & ex.ToString
            End Try
        Else
            span1.InnerHtml = "Select a file using the browse button."
            Exit Sub
        End If
===========================================================================
TASK 2
===========================================================================
        Dim i As Integer
        Dim myFile As String
        Try
            For i = 0 To gvwUploadFiles.Rows.Count - 1
                myFile = DirectCast(gvwUploadFiles.Rows(i).FindControl("HLinkFile"), Label).Text
                File.Copy(ViewState("myFile") & "\" & myFile, "C:\UploadedUserFiles\" & myFile, True)
            Next i
 
            span1.InnerHtml = "File upload successful."
        Catch ex As Exception
            span1.InnerHtml = "File upload FAILED."
        End Try
===========================================================================

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