== Why is this an issue?

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 (``++static void Main++`` method) of an assembly using Windows Forms is not marked as STA.


=== Noncompliant code example

[source,csharp]
----
using System; 
using System.Windows.Forms;

namespace MyLibrary
{
    public class MyForm: Form
    {
        public MyForm()
        {
            this.Text = "Hello World!";
        }

        public static void Main()  // Noncompliant
        {
            var form = new MyForm();
            Application.Run(form);
        }
    }
}
----


=== Compliant solution

[source,csharp]
----
using System; 
using System.Windows.Forms;

namespace MyLibrary
{
    public class MyForm: Form
    {
        public MyForm()
        {
            this.Text = "Hello World!";
        }

        [STAThread]
        public static void Main()
        {
            var form = new MyForm();
            Application.Run(form);
        }
    }
}
----

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== Implementation Specification
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include::../message.adoc[]

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