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[DllImport("kernel32.dll")]

public static extern int WinExec(string exeName, int operType); 

public Form1()

{

    InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

    WinExec(@"D:\project\LiuLun\LiuLun.Browser.Demo5\App\pdf.dll",1);

}