A small detail of the registry operation under C # _c# Tutorial

First look at a code with the wrong:

string subkeyname = @ "software\microsoft\windows\currentversion\run\"; subkey Name
string valuename = @ "App Name"; Name of the more specific key that would hold the value, "" means (Default)
Try
... {
RegistryKey reg = Registry.LocalMachine.OpenSubKey (subkeyname);
if (reg!= null)
... {
Reg. DeleteValue (VALUENAME);
Reg. Close ();
}
}
catch (Exception ex)
... {
MessageBox.Show (This, ex. ToString ());
}
To execute this code, you may receive the following exception:
System.UnauthorizedAccessException
The reason is simple:
Registrykey.opensubkey (String) retrieves subkeys as read-only
Public RegistryKey OpenSubKey (string name, bool writable) writable set to True if you want write access to the item.
We need to take a second parameter that indicates that we are open in a writable way.