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VB.NET/C# and JavaScript communication

Introduction
This article is about passing data between VB.NET/C# WinForms and JavaScript.
Before reading further, let me warn you that this article is not about ASP.NET. Concepts covered in the article are applied to Desktop applications.
Background
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Public Const FILE_CONFIG = "MZZ.xml"
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Dim tblXML_DB As DataTable
Dim dtCod As New DataTable
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Private Declare Function SetWindowLong Lib "user32" Alias "SetW ......
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