call system dll method csharp

call system dll method in csharp application.

in this example we are using User32.dll file.

using System;
using System.Runtime.InteropServices;

class DllImportDemo
{
[DllImport("User32.dll", EntryPoint="MessageBox")]
static extern int MessageDialog(int inthWnd,string strmsg,string strCaption,int intMsgType);

    [STAThread]
    static void Main(string[] args)
    {
        MessageDialog(0, "MessageDialog is Called!", "DllImport Demo", 1);
    }
}