public class CalendarAppointmentCellType : CalendarCellType 

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using GrapeCity.Win.CalendarGrid;

namespace CalendarGridSampleCode
{
    public class AppointmentCellDemo : Form
    {
        private GcCalendarGrid gcCalendarGrid = new GcCalendarGrid();

        public AppointmentCellDemo()
        {
            this.Text = "AppointmentCell Demo";
            this.Size = new Size(800, 700);
            this.StartPosition = FormStartPosition.CenterScreen;
            this.Load += AppointmentCellDemo_Load;

            this.gcCalendarGrid.Template = this.CreateTemplate();
            this.gcCalendarGrid.FirstDateInView = new DateTime(2014, 1, 1);
            this.gcCalendarGrid.AppointmentCellDragging += gcCalendarGrid_AppointmentCellDragging;
            
            // Add GcCalendarGrid to form
            this.gcCalendarGrid.Dock = DockStyle.Fill;
            this.Controls.Add(this.gcCalendarGrid);
        }

        void AppointmentCellDemo_Load(object sender, EventArgs e)
        {
            this.gcCalendarGrid[new DateTime(2014, 1, 12)][1, 0].Value = "You have an appointment between these days.";
            this.gcCalendarGrid[new DateTime(2014, 1, 12)][1, 0].ColumnSpan = 5;

            AngleBracketShapeRenderer render = new AngleBracketShapeRenderer();
            render.ArrowLength = 15;
            render.FillColor = Color.GreenYellow;
            render.LineColor = Color.Orange;
            render.LineStyle = CalendarShapeLineStyle.Thin;
            render.LineWidth = 2;

            (this.gcCalendarGrid[DateTime.Today][1, 0].CellType as CalendarAppointmentCellType).Renderer = render;
        }

        void gcCalendarGrid_AppointmentCellDragging(object sender, AppointmentCellDraggingEventArgs e)
        {
            //The following code will make the appointment limited between 2014/1/1 and 2014/1/31, and the original appointment date cannot be changed to shorter.
            if (e.StartCellPosition.RowIndex == 1 && e.StartCellPosition.ColumnIndex == 0)
            {
                if (e.DraggingHandle == HandlePosition.Left)
                {
                    if (e.TargetCellPosition.Date >= new DateTime(2014, 1, 1) && e.TargetCellPosition.Date <= e.StartCellPosition.Date)
                    {
                        e.AllowDrop = true;
                    }
                    else
                    {
                        e.AllowDrop = false;
                    }
                }
                else if(e.DraggingHandle == HandlePosition.Right)
                {
                    if (e.TargetCellPosition.Date <= new DateTime(2014, 1, 31) && e.TargetCellPosition.Date >= e.EndCellPosition.Date)
                    {
                        e.AllowDrop = true;
                    }
                    else
                    {
                        e.AllowDrop = false;
                    }
                }
            }
        }

        private CalendarTemplate CreateTemplate()
        {
            GrapeCity.Win.CalendarGrid.CalendarTemplate calendarTemplate1 = new GrapeCity.Win.CalendarGrid.CalendarTemplate();
            GrapeCity.Win.CalendarGrid.CalendarHeaderCellType calendarHeaderCellType1 = new GrapeCity.Win.CalendarGrid.CalendarHeaderCellType();
            GrapeCity.Win.CalendarGrid.CalendarAppointmentCellType calendarAppointmentCellType1 = new GrapeCity.Win.CalendarGrid.CalendarAppointmentCellType();
            calendarTemplate1.RowCount = 3;
            calendarTemplate1.RowHeaderColumnCount = 0;
            calendarTemplate1.ColumnHeader.CellStyleName = "defaultStyle";
            calendarHeaderCellType1.SupportLocalization = true;
            calendarTemplate1.ColumnHeader.GetCell(0, 0).CellType = calendarHeaderCellType1;
            calendarTemplate1.ColumnHeader.GetCell(0, 0).DateFormat = "{DayOfWeek}";
            calendarTemplate1.ColumnHeader.GetCell(0, 0).CellStyle.Alignment = GrapeCity.Win.CalendarGrid.CalendarGridContentAlignment.MiddleCenter;
            calendarTemplate1.Content.CellStyleName = "defaultStyle";
            calendarTemplate1.Content.GetCell(0, 0).DateFormat = "d日";
            calendarTemplate1.Content.GetCell(0, 0).DateFormatType = GrapeCity.Win.CalendarGrid.CalendarDateFormatType.DotNet;
            calendarAppointmentCellType1.SupportLocalization = true;
            calendarTemplate1.Content.GetCell(1, 0).CellType = calendarAppointmentCellType1;
            calendarTemplate1.Content.GetCell(2, 0).DateFormat = "{Rokuyou}";
            calendarTemplate1.Content.GetCell(2, 0).CellStyle.Alignment = GrapeCity.Win.CalendarGrid.CalendarGridContentAlignment.MiddleRight;
            return calendarTemplate1;
        }

        [STAThreadAttribute()]
        public static void Main()
        {
            Application.EnableVisualStyles();
            Application.Run(new AppointmentCellDemo());
        }
    }
}