public class CalendarComboBoxCellType : CalendarListCellType 

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

namespace CalendarGridSampleCode
{
    public class ComboBoxCellDemo : Form
    {
        private GcCalendarGrid gcCalendarGrid1 = new GcCalendarGrid();
        
        private Label descriptionLable = new Label();

        public ComboBoxCellDemo()
        {
            this.Text = "ComboBoxCell Demo";
            this.Size = new Size(400, 300);

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

            descriptionLable.Height = 40;
            descriptionLable.BackColor = SystemColors.Info;
            descriptionLable.Dock = DockStyle.Bottom;
            this.Controls.Add(descriptionLable);

            this.gcCalendarGrid1.CellEnter += gcCalendarGrid1_CellEnter;
            this.Load += Form1_Load;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // create a template with 4 combo box cells.
            CalendarComboBoxCellType unboundComboCell = this.CreateCommonComboBoxCell();

            CalendarComboBoxCellType dataBindingComboCell = this.CreateDatabindingComboBoxCell();

            CalendarComboBoxCellType autoCompleteComboCell = this.CreateAutoCompleteComboBoxCell();

            CalendarComboBoxCellType hiddenDropDownButtonComboCell = this.CreateComboBoxCellHiddenDropDownButton();

            this.gcCalendarGrid1.Template = CalendarTemplate.CreateDefaultTemplate();
            CalendarListView listView = new CalendarListView();
            listView.DayCount = 7;
            listView.Orientation = Orientation.Vertical;
            this.gcCalendarGrid1.CalendarView = listView;
            this.gcCalendarGrid1.Template.ColumnCount = 5;
            this.gcCalendarGrid1.Template.Content[0, 1].Value = "Common";
            this.gcCalendarGrid1.Template.Content[0, 2].Value = "Databinding";
            this.gcCalendarGrid1.Template.Content[0, 3].Value = "AutoComplete";
            this.gcCalendarGrid1.Template.Content[0, 4].Value = "Hide Button";

            this.gcCalendarGrid1.Template.Content[1, 1].CellType = unboundComboCell;
            this.gcCalendarGrid1.Template.Content[1, 2].CellType = dataBindingComboCell;
            this.gcCalendarGrid1.Template.Content[1, 3].CellType = autoCompleteComboCell;
            this.gcCalendarGrid1.Template.Content[1, 4].CellType = hiddenDropDownButtonComboCell;
        }

        void gcCalendarGrid1_CellEnter(object sender, CalendarCellMoveEventArgs e)
        {
            switch (e.CellPosition.ColumnIndex)
            {
                case 1:
                    descriptionLable.Text = "Common combo box cell setting. You can click the cell to show drop down list, and select a item in the list to edit cell";
                    break;
                case 2:
                    descriptionLable.Text = "The combo box cell binding to a data table which have two columns 'ID' and 'Name', drop list will lists 'Name', and when you select a item, 'ID' will be stored.";
                    break;
                case 3:
                    descriptionLable.Text = "When you input some char, the cell will show some recommended values. Try input 'a' or 'b' and watch what happened";
                    break;
                case 4:
                    descriptionLable.Text = "Combo box cell hides its drop down button";
                    break;
                default:
                    descriptionLable.Text = string.Empty;
                    break;
            }
        }

        CalendarComboBoxCellType CreateCommonComboBoxCell()
        {
            CalendarComboBoxCellType comboBoxCell = new CalendarComboBoxCellType();

            // The item which listed in drop down window. 
            comboBoxCell.Items.Add("Item2");
            comboBoxCell.Items.Add("Item1");
            comboBoxCell.Items.Add("Item3");
            comboBoxCell.Items.Add("Item4");
            comboBoxCell.Items.Add("Long Item to Make Ellipsis Show");

            // Sort items.
            comboBoxCell.Sorted = true;

            // Drop down window's width, in default, the value is equals to cell's width.
            comboBoxCell.DropDownWidth = 100;

            // In non edit status, if text's length bigger than cell's width, EllipsisString will be shown.
            comboBoxCell.Ellipsis = CalendarGridEllipsisMode.EllipsisEnd;

            return comboBoxCell;
        }

        CalendarComboBoxCellType CreateDatabindingComboBoxCell()
        {
            DataTable dataTable = this.CreatDataTable();

            CalendarComboBoxCellType comboBoxCell = new CalendarComboBoxCellType();

            // Binding items to a data source.
            comboBoxCell.DataSource = dataTable;

            // The column "Name" of data source will be use to display in the drop down list.
            comboBoxCell.DisplayMember = "Name";

            // When user select a value, the corresponding "ID" will be save as cell's value.
            comboBoxCell.ValueMember = "ID";

            return comboBoxCell;
        }

        private DataTable CreatDataTable()
        {
            DataTable dataTable = new DataTable();
            dataTable.Columns.Add("ID", typeof(int));
            dataTable.Columns.Add("Name", typeof(string));

            dataTable.Rows.Add(0, "Barry");
            dataTable.Rows.Add(1, "Colin");
            dataTable.Rows.Add(2, "Robert");
            dataTable.Rows.Add(3, "Walter");
            dataTable.Rows.Add(4, "Wedy");

            return dataTable;
        }

        CalendarComboBoxCellType CreateAutoCompleteComboBoxCell()
        {
            CalendarComboBoxCellType comboBoxCell = new CalendarComboBoxCellType();

            comboBoxCell.DropDownStyle = CalendarGridComboBoxStyle.DropDown;
            comboBoxCell.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            comboBoxCell.AutoCompleteSource = AutoCompleteSource.CustomSource;
            string[] customSourceItems = new string[] { "aaa", "bbb", "ccc", "ddd" };
            comboBoxCell.AutoCompleteCustomSource.AddRange(customSourceItems);

            comboBoxCell.Items.Add("(none)");
            comboBoxCell.Items.Add("aaa");
            comboBoxCell.Items.Add("bbb");
            comboBoxCell.Items.Add("ccc");
            comboBoxCell.Items.Add("ddd");

            return comboBoxCell;
        }

        CalendarComboBoxCellType CreateComboBoxCellHiddenDropDownButton()
        {
            CalendarComboBoxCellType comboBoxCell = new CalendarComboBoxCellType();

            comboBoxCell.DropDownStyle = CalendarGridComboBoxStyle.DropDown;

            // Hide drop down button when non edit status.
            comboBoxCell.ShowDropDownButton = CalendarCellButtonVisibility.NotShown;

            comboBoxCell.Items.Add("Item1");
            comboBoxCell.Items.Add("Item2");

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