C#

System.Drawing.Drawing2D.GraphicsPath gPath = new System.Drawing.Drawing2D.GraphicsPath();
System.Drawing.Rectangle formRectangle = this.Bounds;
gPath.AddEllipse(0, 0, formRectangle.Width, formRectangle.Height);
this.Region = new System.Drawing.Region(gPath);

private Point           _startDragPoint;
private System.Timers.Timer TimerMovePad;

this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.yourFormMouseUp);
this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.yourFormMouseMove);
this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.yourFormMouseDown);

public void MovePadMouseDown(System.Windows.Forms.MouseEventArgs e)
{
    // Set the drag flag for the mousemove event
    _dragModeEnabled = true;

    // Record the start point for the slider movement
    _startDragPoint = new Point(e.X, e.Y);
}

public void MovePadMouseMove(System.Windows.Forms.MouseEventArgs e)
{
    if (_dragModeEnabled == false)
        return;

    MovePad(e);
}

public void MovePadMouseUp(System.Windows.Forms.MouseEventArgs e)
{
    if (_dragModeEnabled == false)
        return;

    // Reset the drag flag
    _dragModeEnabled = false;
    MovePad(e);
}

private void MovePad(System.Windows.Forms.MouseEventArgs e)
{
    if(TimerMovePad == null)
    {
        this.TimerMovePad = new System.Timers.Timer();
        this.TimerMovePad.Interval = 100;
        this.TimerMovePad.Elapsed +=new System.Timers.ElapsedEventHandler(TimerMovePad_Elapsed);
    }

    if (TimerMovePad.Enabled == false)
    {
        TimerMovePad.Enabled = true;
    }

    if(_movementok == true)
    {
        _movementok = false;

        //Hier wird die zurückgelegt strecke in Pixel ermittelt.
        int delta_x = e.X - _startDragPoint.X;
        int delta_y = e.Y - _startDragPoint.Y;

        //Hier wird die Position neu bestimmt
        this.Location = new Point((this.Location.X + delta_x), (this.Location.Y + delta_y));
    }
}

private void TimerMovePad_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
    TimerMovePad.Enabled = false;
    _movementok = true;
}

private void yourFormMouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
    MovePadMouseDown(e);
}

private void yourFormMouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
    MovePadMouseMove(e);
}

private void yourFormMouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
    MovePadMouseUp(e);
}

James R. Twine wrote:

I am thinking it may be connected to the C# code's memory management

James R. Twine wrote:

I have an out-of-proc COM server.

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
  if (e.KeyChar == 't')
  {
    e.Handled = true;
  }
}

//With the inherit textbox
protected override void OnKeyPress(KeyPressEventArgs e)
{
    string _allowedkeychars = "1234567890";
    if (_allowedkeychars.IndexOf(e.KeyChar) < 0)  
    {
	e.Handled = true;
	return;
    }
    base.OnKeyPress (e);
}
 
//With the KeyPress event
private void YourTextBoxKeyPress(object sender, KeyPressEventArgs e)
{
    string _allowedkeychars = "1234567890";
    if (_allowedkeychars.IndexOf(e.KeyChar) < 0)  
    {
	e.Handled = true;
	return;
    }
}