Here's a few random musings from a day of testing a few months ago. I was trying to test some workflow designer scenarios involving gac'ed custom assemblies.
Q. Where is gacutil.exe?
Q. Using the following code why do I not get anything in stderr or stdout when gacutil returns exit code 1?
ProcessStartInfo gac = new ProcessStartInfo(path, args);
gac.UseShellExecute = false;
gac.RedirectStandardError = true;
gac.RedirectStandardOutput = true;
Process gacProcess = Process.Start(gac);
int exitCode = gacProcess.ExitCode;
string stderr = gacProcess.StandardError.ReadToEnd();
string stdout = gacProcess.StandardError.ReadToEnd();
(Answer: two reasons.
#1 is in the sample comments on MSDN:
// Do not wait for the child process to exit before
// reading to the end of its redirected error stream.
// Read the error stream first and then wait.
Reason #2: There is also a copy/paste bug)
Q. Where does reg.exe work when I pass it /f on the command line but not in code?
(Answer - I was always passing /f at the end when using the command line, but at the start in my code. Reg.exe requires /f after the key name.)
Q. Why isn't my Delay Signing Verification Override working? (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\StrongName\Verification\RARM_Main,93D370B399D1A40)
(Answer - Yet another copy/paste bug. I missed one digit at the end. Sigh.)