How to read and write value from registry in Windows CE?

http://msdn.microsoft.com/en-us/library/microsoft.win32.registry%28v=VS.90%29.aspx

Try this:

//using Microsoft.Win32;

RegistryKey reg = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\WJST\WLAN", true); 

// set value of "CDInsert" to 1
reg.SetValue("CDInsert", 1, RegistryValueKind.DWord);

// get value of "CDInsert"; return 0 if value not found
int value = (int)reg.GetValue("CDInsert", 0);