public class CalendarGcMaskCellType : CalendarFieldsEditorCell 

using System;
using System.Windows.Forms;
using System.Drawing;
using GrapeCity.Win.CalendarGrid.InputMan;
using GrapeCity.Win.CalendarGrid;

namespace CalendarGridSampleCode
{
    class GcMaskCellDemo : Form
    {
        private GcCalendarGrid gcCalendarGrid1 = new GcCalendarGrid();
        private Label label = new Label();

        public GcMaskCellDemo()
        {
            this.Text = "GcMaskCell Demo";
            this.Size = new Size(350, 300);

            // Add GcCalendarGrid to form
            this.gcCalendarGrid1.Dock = DockStyle.Fill;
            this.Controls.Add(this.gcCalendarGrid1);

            this.label.Dock = DockStyle.Bottom;
            this.label.Height = 50;
            this.label.BackColor = SystemColors.Info;
            this.label.Text = "You can only input the post code to these GcMaskCell.";
            this.Controls.Add(label);

            this.Load += Form1_Load;

            this.StartPosition = FormStartPosition.CenterScreen;
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            CalendarGcMaskCellType gcMaskCell1 = new CalendarGcMaskCellType();
            SetGcMaskCellFields(gcMaskCell1);

            CalendarTemplate template1 = CalendarTemplate.CreateDefaultTemplate();
            template1.Content[1, 0].CellType = gcMaskCell1;
            template1.Content[2, 0].CellType = gcMaskCell1.Clone();

            gcCalendarGrid1.Template = template1;
        }

        private void SetGcMaskCellFields(CalendarGcMaskCellType gcMaskCell1)
        {
            gcMaskCell1.Fields.Clear();

            MaskPatternField maskPatternField1 = new MaskPatternField();
            MaskLiteralField maskLiteralField1 = new MaskLiteralField();
            MaskPatternField maskPatternField2 = new MaskPatternField();

            maskPatternField1.MaxLength = 3;
            maskPatternField1.MinLength = 3;
            maskPatternField1.Pattern = "\\D";
            maskLiteralField1.Text = "-";
            maskPatternField2.MaxLength = 4;
            maskPatternField2.MinLength = 4;
            maskPatternField2.Pattern = "\\D";

            gcMaskCell1.Fields.AddRange(new MaskField[] { maskPatternField1, maskLiteralField1, maskPatternField2 });
        }

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