Windows registry in C#.net

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C#2.0

C#

Hi Friends,
I am New in C#.net. I am using Windows registry in C#.net. My task is "Right Click Event".that means in my exe will work in Right Click event.So I am storing my exe path in "Windows Registry".I have tested a coding in two way .
1).Command Line Argument in Project Property.
2).Right Click On the File.My Project will run.
In First way,processing is Very fast.But in Second way it takes long time.I am using same coding.But why does second way take very long time?Please give any idea.
Thanks
Regards,
Lakshmi narayanan.S