How to get installation path and dispaly in textbox?

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C#

Windows

C#4.0

application

form

In my project i need to show a path in textbox ?like below

in my company one product software is there.......... assume like visual studio ,when i install that application.
as usuall like visual studio it will store all projects in some location default in c:\users\hp\documents\visual studio 2010\Projects
are manually we gave in any other drive d:\Myprojects\projects

->coming to my project when ever i run my application in windows form in c#
->it will show a textbox, in that text box ,i need to display path which will store all projects of my application...as said above [d:\Myprojects\projects]

->please give me a full code how we can get visual studio path ,where my project will store ,that path should display in textbox.....it will help me lot please help me...................:(