Change Registry Value using C#

Hi,

I have desktop c# application, and when this application main frm loads i want to update some registry value to null ...
the regsitry value resided on:

HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\.Default\.Current

This key have default vallue as (%SystemRoot%\media\Windows XP Ding.wav)

And i  just want to replace it with null ! i tried this and didnt work !


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RegistryKey rkHKLM = Registry.CurrentUser; ;            
RegistryKey rkRun;
 
rkRun =
rkHKLM.OpenSubKey(@"HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\.Default\.Current", true);
 
rkRun.SetValue("Default", "");                      
Registry.CurrentUser.Flush();