using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 窗口最前端
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){Form2 frm = new Form2();frm.Show();}}
}

将form1的 topmost设置为 true

project以及效果

http://yunpan.cn/csJANhJ3BVueY  提取码 3917