Calling .net dll from NSIS

Hi All,
I want to validate username and password before installing the setup which is created using NSIS. When i click on the next button, i want to check whether he is authorized to install the application, for that i want to call a WCF from my .net application and it will return true or false. based on that i will proceed my installation. I tried using CLR::Call /NOUNLOAD plugin. since am referring service reference it throwing the exception as Error calling .net dll method

Can you share more details with us? Maybe piece of script?

I would recommend changing it to a command line executable instead which you can execute using ExecDos.

Stu