Open window form on right side

private void OpenForm(Form form)
  {
      PositionReporterEdge(form);
      form.Show();
  }

  /// <summary>
  /// Position the "Reporter" form next to the current form.
  /// </summary>
  private void PositionReporterEdge(Form form)
  {
      int screenHeight = Screen.PrimaryScreen.WorkingArea.Height;
      int screenWidth = Screen.PrimaryScreen.WorkingArea.Width;

      Point parentPoint = this.Location;

      int parentHeight = this.Height;
      int parentWidth = this.Width;

      int childHeight = form.Height;
      int childWidth = form.Width;

      int resultX;
      int resultY;

      if ((parentPoint.Y + parentHeight + childHeight) > screenHeight)
      {
          // If we would move off the screen, position near the top.
          resultY = parentPoint.Y + 100; // move down 50
          resultX = parentPoint.X + 50;
      }
      else
      {
          // Position on the edge.
          resultY = parentPoint.Y + parentHeight;
          resultX = parentPoint.X;
      }

      // set our child form to the new position
      form.Location = new Point(resultX, resultY);
  }