// creating Context menu for data grid.
            ToolStripMenuItem mnuStart = new ToolStripMenuItem("Start");
            ToolStripMenuItem mnuStartAll = new ToolStripMenuItem("StartAll");
            ToolStripMenuItem mnuPause = new ToolStripMenuItem("Pause");            
            ToolStripMenuItem mnuDelete = new ToolStripMenuItem("Delete");

            mnuStart.Click += new EventHandler(mnuStart_Click); // creating the event handeler for the context menu.
            mnuStartAll.Click += new EventHandler(mnuStartAll_Click);
            mnuPause.Click += new EventHandler(mnuPause_Click);            
            mnuDelete.Click += new EventHandler(mnuDelete_Click);

            //Add to main context menu
            mnu.Items.AddRange(new ToolStripItem[] { mnuStart, mnuStartAll, mnuStartAll, mnuPause,  mnuDelete });

 private void dgFile_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                if (dgFile.Rows.Count == 0)
                {
                    dgFile.ContextMenuStrip = null;
                }
                else
                {
                    dgFile.ContextMenuStrip = mnu;
                }
            }
        }