You can develop OPC Historical Data Access (HDA) clients in .NET (C# or VB.NET) without having to think about the OPC DCOM interface. The OPCHDA.NET wrapper assembly provides classes and methods that take advantage of the .NET features and make OPC HDA Server access real simple and quick because:

	The OPC functions are provided as methods with an easy to use .NET friendly interface. The data is converted to/from .NET data types. The hand coded .Net wrapper functions are highly optimized and work in 32-bit and 64-bit operation.
	A test client and several sample clients are supplied in C# and VB source code.
	The Visual Studio integrated help contains detailed information including the OPC specifications. Context sensitive help displays the needed information without long searches.
	It can be used for stand-alone OPC HDA clients or combined with OPCDA.NET and/or OPCAE.NET for OPC DA / HDA / AE client applications.

The HDA Test Client application can be used as a diagnostic tool to see what OPC HDA servers are available and if they can be accessed.

The test client can also be used as a development helper tool. The server can be browsed to get the items supported by the server and the item names can be copied into the code of a client being developed.

All OPC HDA 1.2 functions can be called interactively to check if the values are returned as expected. This may help determine if an unexpected behavior has to searched in the client being developed or somewhere else.

Accessing UA Servers
OPCHDA.NET with the OPCHDA.NET-UA option enables clients to access OPC UA servers and Classic OPC HDA servers through the same API.
The server ID (ProgID or URL) determines the type of serve accessed.

No external converters are required and DCOM is completely eliminated.

To make the application test environment complete there is a Test Server included in the OPCHDA.NET package. This server is based on the evaluation version of the OPCHDA.NET Server Toolkit and is tested for OPC HDA V1.2 compliance. It can be adapted to meet the application needs. There is for each item a text file with the data. These files can easily be modified and files can be added to have additional items available. As a product evaluation this server has a 30 minute run-time restriction. For software tests this is rarely a restriction since test runs are usually shorter.

The OPCHDA.NET Features Include
	VB and C# Wizards for quick project creation
	Highly optimized .Net wrapper code
	BrowseTree class shows the browse result in Forms/WPF TreeView controls
	Works in 32-bit and 64-bit operation mode
	Full source code available
	Visual Basic .NET sample client
	VC# .NET sample client
	Visual Studio .Net integrated help
	Developer license with one time fee, no run-time licenses required
	The license includes an Updates/Support subscription for 90 days.

System Requirements
	Windows 8, Windows 7, Vista, XP, Windows 2000 or Windows Server 2003/2008/2012 32-bit or 64-bit .NET Framework 1.1, 2.0, 3.0, 3.5, 4.0 or 4.5
	Microsoft Visual Studio 2003, 2005, 2008, 2010, 2012 or 2013, C# or Visual Basic

Accessing UA Servers thru a Converter

Existing Classic OPC HDA applications can access OPC UA servers without having to be modified.

The COMtoUA converter server enables OPCHDA.NET based client applications to access UA-HA servers.

Product	SKU	Description
Evaluation License	HDANW-EV	The Evaluation License grants the non-exclusive right to use the enclosed software and accompanying documentation for internal evaluation and testing purposes only. It may be used on multiple computers and by multiple users but may not be re-distributed to other locations. The evaluation software is time restricted and to be restarted after 30 minutes run-time.
Single Developer License	HDANW-DL	The Single Developer License grants a single developer the non-exclusive right to use the software on computers within a single software development site owned by the licensee. The license can be transferred on a permanent basis to another developer within the same organization The software may be distributed as part of the licensee's products, free of run-time royalties. Please read the full license agreement . The license includes a subcription for 90 days.
Company Site License	HDANW-SL	The Company Site License grants multiple users the non-exclusive right to use the enclosed software and accompanying documentation on computers, workstations or terminals in a single software development site owned by the licensee. The software may be distributed in binary form as part of the licensee's products, free of run-time royalties. Please read the full license agreement. The license includes a subcription for 90 days.
Company Site License with Source	HDANW-SC	The Company Site License grants multiple users the non-exclusive right to use the enclosed software and accompanying documentation on computers, workstations or terminals in a single software development site owned by the licensee. The software may be distributed in binary form as part of the licensee's products, free of run-time royalties. Please read the full license agreement. The license includes a subcription for 90 days.
Service Subscription Single Developer License	HDANW-SVD	The Service Subscription entitles the owner to download product updates released within the subscription period and get free phone/email product support. The service subscription extends the subscription period for 12 month from the expiring date of the previous subscription respectively 15 month from the product purchase date.
Service Subscription Site License	HDANW-SV	The Service Subscription entitles the owner to download product updates released within the subscription period and get free phone/email product support. The service subscription extends the subscription period for 12 month from the expiring date of the previous subscription respectively 15 month from the product purchase date.
Service Subscription Source License	HDANW-SVS	The Service Subscription entitles the owner to download product updates released within the subscription period and get free phone/email product support. The service subscription extends the subscription period for 12 month from the expiring date of the previous subscription respectively 15 month from the product purchase date.

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