how to get installation folder when uninstalling the application

private string FindByDisplayName(RegistryKey parentKey, string name)
        {
            string[] nameList = parentKey.GetSubKeyNames();
            for (int i = 0; i < nameList.Length; i++)
            {
                RegistryKey regKey =  parentKey.OpenSubKey(nameList[i]);
                try
                {
                    if (regKey.GetValue("DisplayName").ToString() == name)
                    {
                        return regKey.GetValue("InstallLocation").ToString();
                    }
                }
                catch { }
            }
            return "";
        }

RegistryKey regKey = Registry.LocalMachine.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Uninstall");
string location = FindByDisplayName(regKey, "MSN");
MessageBox.Show(location);