[quote user="saravana kumar"]I dont have any idea about this[/quote]
One more thing that can help you in the learning process: Attached is an example of "minimum addin" in C# and VB.NET, that I created some time ago because of another discussion in this forum. I did not test it, just took it from archive, but it should work after referenced assemblies paths will be corrected.
With regards,
Jan
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