Imports System
Imports System.Drawing
Imports System.Windows.Forms

Namespace csTempWindowsApplication1

    Public Class Form1
        Inherits System.Windows.Forms.Form

        ' Constant value was found in the "windows.h" header file.
        Private Const WM_ACTIVATEAPP As Integer = &H1C
        Private appActive As Boolean = True

        <STAThread()> _
        Shared Sub Main()
            Application.Run(New Form1())
        End Sub 'Main

        Public Sub New()
            MyBase.New()

            Me.Size = New System.Drawing.Size(300, 300)
            Me.Text = "Form1"
            Me.Font = New System.Drawing.Font("Microsoft Sans Serif", 18.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        End Sub

        Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)

            ' Paint a string in different styles depending on whether the
            ' application is active.
            If (appActive) Then
                e.Graphics.FillRectangle(SystemBrushes.ActiveCaption, 20, 20, 260, 50)
                e.Graphics.DrawString("Application is active", Me.Font, SystemBrushes.ActiveCaptionText, 20, 20)
            Else
                e.Graphics.FillRectangle(SystemBrushes.InactiveCaption, 20, 20, 260, 50)
                e.Graphics.DrawString("Application is Inactive", Me.Font, SystemBrushes.ActiveCaptionText, 20, 20)
            End If
        End Sub
    <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
        Protected Overrides Sub WndProc(ByRef m As Message)
            ' Listen for operating system messages
            Select Case (m.Msg)
                ' The WM_ACTIVATEAPP message occurs when the application
                ' becomes the active application or becomes inactive.
            Case WM_ACTIVATEAPP

                    ' The WParam value identifies what is occurring.
                    appActive = (m.WParam.ToInt32() <> 0)

                    ' Invalidate to get new text painted.
                    Me.Invalidate()

            End Select
            MyBase.WndProc(m)
        End Sub
    End Class
End Namespace

package JSLTempWindowsApplication1; 

import System.*;
import System.Drawing.*;
import System.Windows.Forms.*;
import System.Security.Permissions.*;

public class Form1 extends System.Windows.Forms.Form
{
    // Constant value was found in the "windows.h" header file.
    private final int WM_ACTIVATEAPP = 0x1C;
    private boolean appActive = true;

    /** @attribute STAThread()
     */
    public static void main(String[] args)
    {
        Application.Run(new Form1());
    } //main

    public Form1()
    {
        this.set_Size(new System.Drawing.Size(300, 300));
        this.set_Text("Form1");
        this.set_Font(new System.Drawing.Font("Microsoft Sans Serif", 18, 
            System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, 
            (ubyte)0));
    } //Form1

    protected void OnPaint(PaintEventArgs e)
    {
        // Paint a string in different styles depending on whether the
        // application is active.
        if (appActive) {
            e.get_Graphics().FillRectangle(SystemBrushes.get_ActiveCaption(), 
                20, 20, 260, 50);
            e.get_Graphics().DrawString("Application is active", 
                this.get_Font(), SystemBrushes.get_ActiveCaptionText(), 
                20, 20);
        }
        else {
            e.get_Graphics().FillRectangle(SystemBrushes.get_InactiveCaption(), 
                20, 20, 260, 50);
            e.get_Graphics().DrawString("Application is Inactive", 
                this.get_Font(), SystemBrushes.get_ActiveCaptionText(),
                20, 20);
        }
    } //OnPaint

    /** @attribute SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode)
    */
    protected void WndProc(/** @ref */Message m)
    {
        // Listen for operating system messages.
        switch (m.get_Msg()) {
            // The WM_ACTIVATEAPP message occurs when the application
            // becomes the active application or becomes inactive.
            case WM_ACTIVATEAPP:
                // The WParam value identifies what is occurring.
                appActive = m.get_WParam().ToInt32() != 0;
                // Invalidate to get new text painted.
                this.Invalidate();
                break;
        }
        super.WndProc(m);
    } //WndProc
} //Form1