>>>After compiling mytest.cs without an error, I run mytest.exe but nothing happens. Am supposed to see a window with a message? What am I doing wrong?
>>
>>No it's working there from command window:) Check temp folder. It should have created test.txt with "Hello from C#" in it.
>>Problem it fails if called from VFP via ShellExecute().
>>Cetin
>
>yes, you are correct. the file test.txt has been successfully created. Now, after I figure out how to run this .exe in ShellExecute in VFP, I will let you know what happens here.

OK. Here is test code (assuming exe is c:\temp\test.exe):

DECLARE INTEGER ShellExecute IN shell32.dll ; 
 INTEGER hwnd, ; 
 STRING operation, ; 
 STRING file, ; 
 STRING params, ; 
 STRING workdir, ; 
 INTEGER showcmd

? ShellExecute(0,"Open","c:\temp\test.exe",0,0,1)

Hope you get something over 32 as return value.
Cetin