There may be some situations where you would like to retrieve the size of a given file. Below is a quick piece of code that will do exactly that. It will return the size of the file in bytes.
Imports System.IO
Private Function GetFileSize(ByVal MyFilePath As String) As Long
Dim MyFile As New FileInfo(MyFilePath)
Dim FileSize As Long = MyFile.Length
Return FileSize
End Function
To display the file size in a human readable format see this post