Windows Forms

Public Class Form1

  Private Sub ToolStripButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.Click
    Try
      WebBrowser1.Navigate("http://www.google.com/")
    Catch ex As Exception
      MsgBox(ex.ToString)
    End Try
  End Sub

  Private Sub WebBrowser1_Navigated(ByVal sender As Object, ByVal e As System.Windows.Forms.WebBrowserNavigatedEventArgs) Handles WebBrowser1.Navigated
    'Text box in toolstrip
    txt.Text = WebBrowser1.Url.ToString
  End Sub
End Class

softdev_sup wrote:

how can we change the type of the control of Tool Strip like from button to Drop down button at run time

softdev_sup wrote:

how to specofy that the type is dropdown or combobox or something else

private Panel panel;
private bool paintRectFlag=true;
private Rectangle rect=new Rectangle(20, 20, 300, 200);
private Pen rectPen=Pens.Black;

public Form1() {
    InitializeComponents();
    panel=new Panel();
    panel.Bounds=new Rectangle(…);
    panel.Paint+=panelPaintHandler;
    Controls.Add(panel);
}

protected void panelPaintHandler(object sender, PaintEventArgs e) {
    Graphics g=e.Graphics;
    if (paintRectFlag) g.DrawRectangle(rectPen, rect);
}

protected void buttonClickHandler(object sender, EventArgs e) {
    paintRectFlag=!paintRectFlag;   // toggle visible flag
    panel.Invalidate();
}

farzadmf wrote:

1. Why do you find the PictureBox control a useless one?

farzadmf wrote:

2. Why did you say that we shouldn't call the CreateGraphics method?

farzadmf wrote:

3. What exactly does the Panel.Invalidate() method do and how it can be used here?

farzadmf wrote:

4. Why did you say that either create the pen, font, etc. object as class members or create them inside the Paint event handler and call the Dispose method? Why is the Dispose method necessary here and what's the difference between these two methods you mentioned.