"C-Services Holland b.v." wrote:

> Hmm nobody knows anything about this?
>
> Rinze van Huizen
>
> C-Services Holland b.v. wrote:
> > Hi all,
> >
> > I've run into a problem trying to print from vb.net (2002) in Windows
> > 98. To test it I've setup a single form with a button and the following
> > code:
> >
> > 'the form has a button called Button1, a printdocument1, a printdialog1,
> > a printpreviewdialog1 and the following code:
> >
> > Private Sub PrintDocument1_PrintPage(ByVal sender as System.Object,
> > ByVal e As System.Drawing.Printing.PrintpageEventArgs) handles
> > PrintDocument1.PrintPage
> > 'print Testpage to the printer
> >     e.Graphics.DrawString("Testpage", printFont, New
> > SolidBrush(Color.Black), 100, 100)
> > End Sub
> >
> > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles Button1.Click
> >     PrintDialog1.PrinterSettings = PrintDocument1.PrinterSettings
> >     PrintDialog1.ShowDialog()
> >     printFont = New Font("Arial", 10)
> >     PrintPreviewDialog1.Document = PrintDocument1
> >     PrintPreviewDialog1.Show()
> > End Sub
> >
> > This works just fine on Win2000 or XP, but on the Windows98 station it
> > throws an exception when I click the button:
> >
> > "The application attempted to perform an operation not allowed by the
> > security policy. The operation required the SecurityException. To grant
> > this application the required permission please contact your system
> > administrator, or use the Microsoft .NET security policy administration
> > tool.
> >
> > < if you click...snip>
> >
> > Request for the permission of type
> > System.Drawing.Printing.PrintingPermission, System.Drawing,
> > Version=1.0.3300.0, Culture=neutral,
> > PublicKeyToken=b-3f5f7f11d50a3a failed."
> >
> > Why is it complaining about security stuff. It's Win98. It doesn't have
> > policies AFAIK. Besides it's a computer of the sysop, he wouldn't
> > confine himself. The error occured printing to a real printer and to a
> > PDF printing driver.
> >
> > I made this test because my application threw an error when printing but
> > that one was different:
> >
> > ***** Exception Text ******
> > System.NullReferenceException: Object reference not set to an instance
> > of an object.
> > at System.Windows.Forms.PrintPrevieuwControls.CalculatePageInfo()
> > at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
> >
> > ***************************
> >
> > My application runs like it should on all other platforms we have except
> > Windows 98 (we tried different machines). Now the docs stated for all
> > components used that the platforms supported was Win98 and up, so that
> > shouldn't be the problem. All machines have the .NET framework
> > installed. Any idea's what I've messed up here?
> >
> > Rinze van Huizen
>

> Just use caspol.exe which is present in .NET Framework. Provide 'Full Trust'
> to run your code.
>
>