WinForm特效:同时让两个窗体有激活效

        using System;
        using System..Forms;
        using System.Runtime.InteropServices;
        namespace Application43
        {
            public partial class Form1 : Form
            {
                Form frm =null;
                public Form1()
                {
                    InitializeComponent();
                    this.Activated += Form_Activated;
                }
                const int WM_NCACTIVATE = 0x86;
                const int WA_ACTIVE = 0x1;
                [DllImport("user32.dll", EntryPoint = "SendMessage")]
                public static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);
                private void button1_Click(object sender, EventArgs e)
                {
                    frm = new Form();
                    frm.Text = "jinjazz";
                    frm.Activated += Form_Activated;
                    frm.Show();
                    frm.Location = new System.Drawing.Point(this.Left + this.Width, this.Top);
                    SendMessage(this.Handle, WM_NCACTIVATE, WA_ACTIVE, 0);
                }
                void Form_Activated(object sender, EventArgs e)
                {
                    SendMessage(this.Handle, WM_NCACTIVATE, WA_ACTIVE, 0);
                    if (frm != null)
                        SendMessage(frm.Handle, WM_NCACTIVATE, WA_ACTIVE, 0);
                }
            }
        }

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