Problem in painting custom panel control (.Net Framework 4.0).

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I have inherited the standard panel control to create a panel having custom border color. The problem is, while the panel is on a form and any other form is moved across it, it paints hapazard lines of the same color as the panel custom border color, all throughout background of the panel. I tried to Refresh or Invalidate the panel in its paint event but of no avail. The same is happening while designing in the design editor too. Why is this happening and how to get rid of it?
My code follows:

VB

Namespace CustomPanelControl
    Public Class CustomPanel
        Inherits Panel

        Public Sub New()
            MyBase.New()
        End Sub

        Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
            MyBase.OnPaint(e)

            'Set the backcolor of the panel according to the focus on it.
            If Me.ContainsFocus Then
                Me.BackColor = Color.Yellow
            Else
                Me.BackColor = Color.White
            End If

            'Draw the border of the panel.
            If Me.BorderStyle = BorderStyle.None Then
                Dim borderWidth As Integer = 1
                Dim BorderColor As Color = Color.Blue
                ControlPaint.DrawBorder(e.Graphics, e.ClipRectangle, BorderColor, borderWidth, ButtonBorderStyle.Solid, BorderColor, borderWidth, ButtonBorderStyle.Solid, BorderColor, _
                borderWidth, ButtonBorderStyle.Solid, BorderColor, borderWidth, ButtonBorderStyle.Solid)
            End If
        End Sub
    End Class
End Namespace

Posted 7-Dec-11 4:48am

priyamtheone

Updated 7-Dec-11 5:11am

v2

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-12-07T05:28:00

I would try to add System.Windows.Forms.ControlStyles AllPaintingInWmPaint | OptimizedDoubleBuffer using System.Windows.Forms.Control.Control.SetStyle, see:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.setstyle.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.setstyle.aspx[^].

Also, I would derive your class from Control and did not call base OnPaint (and paint the background yourself), as you don't need any functionality specific to Panel.

However, I don't see anything fundamentally wrong in your code; I would even suspect that something is wrong with your system. I remember I had some Forms artifacts showing on Windows 2000 but never on XP. So, I would suggest you try your code on different systems, just in case.

—SA