Question

How to use MessageBox() Windows API function in C#

Answer 1

using System;
using System.Runtime.InteropServices;

namespace API
{
	class Class1
	{
		[DllImport("user32.dll", CharSet=CharSet.Unicode)] 
		public static extern int MessageBox(int h, string m, string c, int type); 
		
		static void Main(string[] args)
		{
			string pText = "Hello World!"; 
			string pCaption = "MessageBox API"; 
			MessageBox(0, pText, pCaption, 0); 
		}
	}
}

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