C#

dgvSchedule.DoDragDrop(text, DragDropEffects.Copy); 
if (bDataDrop == true) 
{ 
           dgvSchedule.Rows[info.RowIndex].Cells[info.ColumnIndex].Value = null;         //setting the value to null 
           dgvSchedule.Rows[info.RowIndex].Cells[info.ColumnIndex].Selected = false;   //setting that cell to not selected 
           bDataDrop = false;                
} 

//Form1.cs--------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace ScreenSaver
{
    public partial class Form1 : Form
    {


        private int screenNumber;
        private Point MouseXY;
        int curX = 1;
        int curY = 1;
        Boolean running = true;

        public Form1(int screen)
        {
            screenNumber = screen;

            InitializeComponent();
            this.run();
           
        }
        private void form1_Load(object sender, System.EventArgs e)
        {
            this.Bounds = Screen.AllScreens[screenNumber].Bounds;
            Cursor.Hide();
            TopMost = true;
           
        }
        private void onMouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (!MouseXY.IsEmpty)
            {
                if(MouseXY != new Point(e.X,e.Y))
                {
                    running = false;
                }
                if(e.Clicks >0)
                {
                    running = false;
                }
            }
            MouseXY = new Point(e.X, e.Y);
           
        }
       public void run()
        {
                while (running)
                {
                    loopMove();
                    Thread.Sleep(1000);
                }

                Close();
        }

        private void LM_Click(object sender, EventArgs e)
        {

        }
        private void changeLMY(int y)
        {
            LM.Left += y;

        }
        private void changeLMX(int x)
        {
            LM.Top += x;
        }
        private void loopMove()
        {
            int fX = this.Top;
            int fY = this.Left;
            if (LM.Top >= fX - 300)
                curX = -1;
            if (LM.Top == 0)
                curX = 1;
            if (LM.Left >= fY - 300)
                curY = -1;
            if (LM.Left == 0)
                curY = 1;
            changeLMX(curX);
            changeLMY(curY);

        }
    }
}
//---------------------------------------------------------------------------------------- end Form1

// Program.cs----------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace ScreenSaver
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main(String[] args)
        {
            if (args.Length > 0)
            {
                if (args[0].ToLower().Trim().Substring(0, 2) == "/c")
                {
                }
                else if(args[0].ToLower()== "/s")
                {
                }
                else if (args[0].ToLower() == "/p")
                {
                }
              

            }
            else
            {
                for (int i = Screen.AllScreens.GetLowerBound(0); i <= Screen.AllScreens.GetLowerBound(0); i++)
                {
                    System.Windows.Forms.Application.Run(new Form1(i));
                }
            }
        }

//end program.cs