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In C# project when I am trying to add reference to a dll for a BarcodeReader Device(csp2.dll). I am getting error as not a registered windows component or dll. make sure that the dll is existing.

If the DLL is a COM component, then make sure it is registered first using Regsvr32.exe, and then add a reference to it in your project through the COM tab.

Alternatively, you can use P/Invoke. E.g.:
[DllImport("csp2.dll", EntryPoint="FUNCTION_NAME_IN_DLL")]
public static extern void MyImportedFunction();

Read more on Platform Invoke.
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Based on your response that it is a C++ DLL (assuming an unmanaged DLL at this point), you have to use System.Runtime.InteropServices to access the functionality of the DLL.

If you don't have the source code to the DLL, you can find out what methods are exported by using a utility called "Depends". It will load a DLL and expose all dependent DLLS and exported methods.

With that info, you can create appropriate interface prototypes with PlatformInvoke.
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Are you sure your dll is a .net dll?
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