ASP.NET

Hi,
I want to upload browsed file to the ftp server but getting this error


 Sub UploadFile()

        Try
            Dim fileName As String = FulFile.PostedFile.FileName
            Dim requestFTP As WebRequest = WebRequest.Create("ftp://...................." & fileName)
            requestFTP.Credentials = New NetworkCredential("userid", "password")
            requestFTP.Method = WebRequestMethods.Ftp.UploadFile


            Dim fStream As FileStream = FulFile.PostedFile.InputStream 'Error:Unable to cast object of type 'System.Web.HttpInputStream' to type 'System.IO.FileStream'.


            Dim bufferLength As Integer = 2048
            Dim buffer As Byte() = New Byte(bufferLength - 1) {}

            Dim uploadStream As Stream = requestFTP.GetRequestStream()
            Dim contentLength As Integer = fStream.Read(buffer, 0, bufferLength)

            While contentLength <> 0
                uploadStream.Write(buffer, 0, contentLength)
                contentLength = fStream.Read(buffer, 0, bufferLength)
            End While
            uploadStream.Close()
            fStream.Close()
            requestFTP = Nothing

            LblMsg.Text = "File Uploading Is SuccessFull..."

        Catch ep As Exception
            LblMsg.Text = ep.Message
        End Try

    End Sub

Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.
i am getting this error after uploaded my application on server. The same application works fine on local.i have used vs 2010,asp.net for the same

Private Function UploadToFTP(ByVal fileToUpload As HttpPostedFile) As Boolean

Try
Dim uploadUrl As String = "ftp://........................."
Dim uploadFileName As String = fileToUpload.FileName

Dim streamObj As Stream = fileToUpload.InputStream
Dim buffer As [Byte]() = New [Byte](fileToUpload.ContentLength - 1) {}
streamObj.Read(buffer, 0, buffer.Length)
streamObj.Close()
streamObj = Nothing

Dim ftpUrl As String = String.Format("{0}/{1}", uploadUrl, uploadFileName)
Dim requestObj As FtpWebRequest = TryCast(FtpWebRequest.Create(ftpUrl), FtpWebRequest)
requestObj.Method = WebRequestMethods.Ftp.UploadFile
requestObj.Credentials = New NetworkCredential("UserID", "Password")
Dim requestStream As Stream = requestObj.GetRequestStream()
requestStream.Write(buffer, 0, buffer.Length)
requestStream.Flush()
requestStream.Close()
requestObj = Nothing

Return True
Catch ex As Exception
Return False
End Try
End Function