C# code : How to get value from windows registry

`public string ReadRegistry(string KeyName)
{
// Opening the registry key
RegistryKey rk = baseRegistryKey;
// Open a subKey as read-only
RegistryKey sk1 = rk.OpenSubKey(subKey);
// If the RegistrySubKey doesn't exist -> (null)
if (sk1 == null)
{
return null;
}
else
{
try
{
// If the RegistryKey exists I get its value
// or null is returned.
return (string)sk1.GetValue(KeyName.ToUpper());
}
catch (Exception e)
{

return null;
}
}
}