rspec/rules/S4210/vbnet/rule.adoc

When an assembly uses Windows Forms (classes and interfaces from the `+System.Windows.Forms+` namespace) its entry point should be marked with the `+STAThreadAttribute+` to indicate that the threading model should be "Single-Threaded Apartment" (STA) which is the only one supported by Windows Forms.

This rule raises an issue when the entry point (`+Shared Sub Main+` method) of an assembly using Windows Forms is not marked as STA.

== Noncompliant Code Example

----
Imports System.Windows.Forms

Public Class Foo
  Shared Sub Main()
    Dim winForm As Form = New Form
    Application.Run(winForm)
  End Sub
End Class
----

== Compliant Solution

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Imports System.Windows.Forms

Public Class Foo
  <STAThread()> Shared Sub Main()
    Dim winForm As Form = New Form
    Application.Run(winForm)
  End Sub
End Class
----