how to know whether a Registry key is exist
for example
RegistryKey rk = Registry.LocalMachine.OpenSubKey("Software\\myTestKey",
true );
if myTestKey is not exist, I want to create it, and set some values to it.
if myTestKey is exist, I want to read values from it.
How to code with c# .net cf.
Thank you.

how to know whether a Registry key is exist?
DearME
Check the return value of OpenSubKey() (as stored in rk) to see if it is null... if it is use CreateSubKey() to create the key as it does not already exist.
Does this work for you