C#

try 
{
    string Path =  @"SOFTWARE\Microsoft\Shared Tools\MSConfig\startupreg"; //
    RegistryKey Run = Registry.LocalMachine;
    Run = Run.OpenSubKey(Path, true);
    string[] SubKeys = Run.GetSubKeyNames(); //Says Run is null
    foreach (string SubKeys1 in SubKeys) 
    {
        richTextBox1.Text += SubKeys1 + "/n";
    }
}
catch (Exception ex) 
{
    richTextBox1.Text = ex.ToString();
}

System.NullReferenceException: Object reference not set to an instance of an object.
   at RegTest.MainForm.RegTest() in f:\Programming\SharpDevelop\SharpDevelop Projects\RegTest\RegTest\MainForm.cs:line 41

try 
{
string Path; 
RegistryKey Run;
try 
{
	Path =  @"SOFTWARE\Wow6432Node\Microsoft\Shared Tools\MSConfig";
	Run = Registry.LocalMachine;
	Run = Run.OpenSubKey(Path, true);
}
catch (Exception ex)
{
	richTextBox1.Text = "Coulndt not find either Wow6432Node: \n" + ex.ToString();
}
Path = @"SOFTWARE\Microsoft\Shared Tools\MSConfig";
Run = Registry.LocalMachine;
Run = Run.OpenSubKey(Path, true);
string[] SubKeys = Run.GetSubKeyNames(); //Says Run is null
foreach (string SubKeys1 in SubKeys) 
{
	richTextBox1.Text += SubKeys1 + "\n";
}
}
catch (Exception ex) 
{
richTextBox1.Text = "Coulndt not find either MSConfig: \n" + ex.ToString();
}

asterix5 wrote:

Nothing happens on pressing the button.

bool isPressed = false;
        BackgroundWorker bgw = new BackgroundWorker();//declare form level worker

        public Form1()
        {
            InitializeComponent();
            button1.MouseDown += new MouseEventHandler(button1_MouseDown);//add mouse down event handler
            button1.MouseUp += new MouseEventHandler(button1_MouseUp);//add mouse up event handler
            bgw.DoWork+=new DoWorkEventHandler(bgw_DoWork);//add handler for bg worker Do Work
            bgw.WorkerSupportsCancellation = true;//ensure you can cancel bg worker
        }

        //This is where bg worker does it's thing
        void  bgw_DoWork(object sender, DoWorkEventArgs e)
        {
            while (isPressed)
            {
                DoWork();//add a to textbox
                Thread.Sleep(1000);//sleep for a second
            }
        }

        void button1_MouseUp(object sender, MouseEventArgs e)
        {
            bgw.CancelAsync();//stop bg worker
            isPressed = false;//set isPressed to false for next time
        }

        void button1_MouseDown(object sender, MouseEventArgs e)
        {
            isPressed = true;//set trigger to true
            bgw.RunWorkerAsync();
        }

        //create delegate for multi task control update
        delegate void doWork();
        void DoWork()
        {
            if (this.InvokeRequired)
            {
                doWork d = new doWork(DoWork);
                this.Invoke(d);
            }
            else
            {
                this.textBox1.Text += "a";
            }
        }