Move The Source Excel Files To Archieve Folder

Using the below script task I am checking for the excel file existence and upon file existence using the data flow task will load the excel data into sql table. After the data is loaded from one file or however number of excel files present, I want to move those into a archieve folder with datetimestamp to the filenames,please let me know how I can move those files with datetimestamp to the filenames, any help is greatly appreciated. Thanks!!

Imports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Runtime
Imports System.IO
Public Class ScriptMain
Public Sub Main()
If File.Exists(ReadVariable("FileNameVariable").ToString()) Then
Dts.TaskResult = Dts.Results.Success
Else
Dts.TaskResult = Dts.Results.Failure
End If
End Sub

'From Daniel Read's Blog - http://www.developerdotstar.com/community/node/512/
Private Function ReadVariable(ByVal varName As String) As Object
Dim result As Object
Try
Dim vars As Variables
Dts.VariableDispenser.LockForRead(varName)
Dts.VariableDispenser.GetVariables(vars)
Try
result = vars(varName).Value
Catch ex As Exception
Throw ex
Finally
vars.Unlock()
End Try
Catch ex As Exception
Throw ex
End Try
Return result
End Function
End Class