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When does the DrawString method fire?

Posted on 2007-03-27
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Last Modified: 2010-04-23
I am trying to use the DrawString method to display data in a label. Why will it onlt display after I clock ok to my messagebox ? I want it to display on formload. Please check out my code example. I am using VB.NET 2003. Thank you.

 '  A font for the standard size text:
        Dim fnt As Font = New Font("Microsoft Sans Serif", 8, FontStyle.Bold)

        '  A Brush to write the text:
        Dim b As Brush = New SolidBrush(Color.Black)
        '  Graphics objects
        Dim lgNH3 As Graphics = lblNH3.CreateGraphics

        MessageBox.Show("HUH?")
        Dim strNH As String = "What the..?"
        lgNH3.DrawString(strNH, fnt, b, 1, 1)
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Question by:IT_Steve
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4 Comments
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 2000 total points
ID: 18803791
Don't use CreateGraphics().

Instead, use the Graphics supplied in the "e" paramter of the Paint() event for whatever control you want to draw on...

For example, with a PictureBox:

    Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
        Dim fnt As Font = New Font("Microsoft Sans Serif", 8, FontStyle.Bold)
        Dim b As Brush = New SolidBrush(Color.Black)
        Dim strNH As String = "What the..?"
        e.Graphics.DrawString(strNH, fnt, b, 1, 1)
        b.Dispose()
        fnt.Dispose()
    End Sub
0
 

Author Comment

by:IT_Steve
ID: 18804040
Thank you Idle_Mind . Your solution works for me. Why did my original way behave as it did?
0
 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 18804176
Because it is rare when CreateGraphics() should actually be used with a Control...since when the control refreshes itself, whatever you drew gets erased.

CreateGraphics() does not give you a persistent drawing surface.
0
 

Author Comment

by:IT_Steve
ID: 18807968
Thank you for the explanation. The points are yours!
Steve
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