How to suppress global mouse click events from windows?

Question

I am developing a windows based application in which i want that whenever my application get started it should disable mouse click events outside the my application

Answer 1

This way it can be done. It uses the win API function BlockInput.

NOTE: CTRL + ALT + DELETE enables the input again. But other mouse and keyboard input is blocked.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern void BlockInput([In, MarshalAs(UnmanagedType.Bool)]bool fBlockIt);

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.Show();
            //Blocks the input
            BlockInput(true);
            System.Threading.Thread.Sleep(5000);
            //Unblocks the input
            BlockInput(false); 
        }
    }
}