WinForm implements an instance of the effect of having two forms active simultaneously

The examples in this article describe the effects that WinForm implements to make two forms active at the same time. The main use of Windows API implementation of a form when the activation of a message to send another. Share to everyone for your reference.

The implementation method is as follows:

Using system;using system.windows.forms;using system.runtime.interopservices;namespace WindowsApplication43{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 w    Param, 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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WinForm implements an instance of the effect of having two forms active simultaneously

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WinForm implements an instance of the effect of having two forms active simultaneously