The OPC Data Client “Classic” and OPC Data Client-UA class libraries are made up of namespaces. Each namespace contains types that you can use in your program: classes, structures, enumerations, delegates, and interfaces.

All our namespaces begin with OpcLabs name. 

Although namespaces are .NET concept, with OPC Data Client you will encounter them also when working from COM tools or Python, because OPC Data Client builds its COM and Python support on top of the .NET assemblies.

In COM, the namespace precedes the actualy type name in the objects's ProgID. In Python, namespaces are made to behave like Python module names.

OPC Data Client “Classic” and OPC Data Client-UA define types mainly in namespaces described in tables under the links below.

• In OpcLabs.BaseLib Assembly
• In OpcLabs.BaseLibComponents Assembly
• In OpcLabs.BaseLibForms Assembly
• In OpcLabs.BaseLibPresentation Assembly
• In OpcLabs.EasyOpcClassic Assembly
• In OpcLabs.EasyOpcClassicComponents Assembly
• In OpcLabs.EasyOpcClassicCore Assembly
• In OpcLabs.EasyOpcForms Assembly
• In OpcLabs.EasyOpcPresentation Assembly
• In OpcLabs.EasyOpcUA Assembly
• In OpcLabs.EasyOpcUAComponents Assembly

You can use symbols contained in the namespaces by using their fully qualified name, such as OpcLabs.EasyOpc.DataAccess.EasyDAClient. In order to save typing and achieve more readable code, you will typically instruct your compiler to make the namespaces you use often available without explicit reference. To do so:

• In Visual Basic (VB.NET), place the corresponding Imports statements at the beginning of your code files.
• In Visual C#, place the corresponding using directives at the beginning of your code files.
• In Visual C++, place the corresponding using namespace directives at the beginning of your code files.
• In Visual F#, place the corresponding open directives at the beginning of your code files.
• In PowerShell, place the corresponding using namespace directives to your script files.
• In Python, place the corresponding from AssemblyName import * statements in your code after importing the Python packages.