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Der angeforderte Registrierungszugriff ist unzulässig.                    

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public void SetStartup(string AppName, bool enable)
        {
            string runKey = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run";

            Microsoft.Win32.RegistryKey startupKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(runKey);

            if (enable)
            {
                if (startupKey.GetValue(AppName) == null)
                {
                    startupKey.Close();
                    <span style="color: red">startupKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(runKey, true)</span>;
                    // Add startup reg key
                    startupKey.SetValue(AppName, "C:\\Users\\patrick\\Desktop");
                    startupKey.Close();
                }
            }
            else
            {
                // remove startup
                startupKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(runKey, true);
                startupKey.DeleteValue(AppName, false);
                startupKey.Close();
            }
        }



        
        private void button1_Click(object sender, EventArgs e)
        {
            SetStartup("Kran", true); 
            
        }