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I forgot to add. My labels are on in Tab #2 and in Groupbox.
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I forgot to add. My labels are on in Tab #2 and in Groupbox.

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There is not enough context to understand how you called it when it wasn't in a button click event handler.
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There is not enough context to understand how you called it when it wasn't in a button click event handler.

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I have a sub below to print in WPF. When I call it, it won't print. However, when I put the code under button 1, it prints. Not sure why. <br />
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Public Sub Printnow()<br />
&nbsp; &nbsp; &nbsp; &nbsp; Dim printDialog As New PrintDialog()<br />
&nbsp; &nbsp; &nbsp; &nbsp; Dim query = New ManagementObjectSearcher(&quot;<wbr />SELECT *FROM Win32_Printer&quot;)<br />
&nbsp; &nbsp; &nbsp; &nbsp; Dim printers = query.Get<br />
&nbsp; &nbsp; &nbsp; &nbsp; For Each printer As ManagementObject In printers &nbsp; 'loop to get Printer name <br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; If printer(&quot;name&quot;).ToString()<wbr /> = &quot;HP 2000&quot; Then<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 'printer.InvokeMethod(&quot;Set<wbr />DefaultPri<wbr />nter&quot;, New Object() {&quot;HP 2000&quot;})<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printer.InvokeMethod(&quot;SetD<wbr />efaultPrin<wbr />ter&quot;, New Object() {&quot;HP 2000&quot;})<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Exit For<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End If<br />
&nbsp; &nbsp; &nbsp; &nbsp; Next<br />
&nbsp; &nbsp; &nbsp; &nbsp; printDialog.PrintVisual(Me<wbr />.GroupBox4<wbr />, &quot;Printing Header&quot;)<br />
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&nbsp; &nbsp; End Sub
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I have a sub below to print in WPF. When I call it, it won't print. However, when I put the code under button 1, it prints. Not sure why. 



Public Sub Printnow()
        Dim printDialog As New PrintDialog()
        Dim query = New ManagementObjectSearcher("SELECT *FROM Win32_Printer")
        Dim printers = query.Get
        For Each printer As ManagementObject In printers   'loop to get Printer name 
            If printer("name").ToString() = "HP 2000" Then
                'printer.InvokeMethod("SetDefaultPrinter", New Object() {"HP 2000"})
                printer.InvokeMethod("SetDefaultPrinter", New Object() {"HP 2000"})
                Exit For
            End If
        Next
        printDialog.PrintVisual(Me.GroupBox4, "Printing Header")

    End Sub

Print in WPF

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