DateTimePicker в DataGridView

ПРИМЕР↓

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace System.Windows.Forms
{
    public class DataGridViewCalendarColumn : DataGridViewColumn
    {
        public DataGridViewCalendarColumn()
                : base(new CalendarCell())
        {
        }
        public override DataGridViewCell CellTemplate
        {
            get
            {
                return base.CellTemplate;
            }
            set
            {
                // Ensure that the cell used for the template is a CalendarCell.
                if (value != null &&
                    !value.GetType().IsAssignableFrom(typeof(CalendarCell)))
                {
                    throw new InvalidCastException("Must be a CalendarCell");
                }
                base.CellTemplate = value;
            }
        }
    }
    public class CalendarCell : DataGridViewTextBoxCell
    {
        public CalendarCell()
            : base()
        {
            // Use the short date format.
            this.Style.Format = "d";
        }
        public override void InitializeEditingControl(int rowIndex, object
            initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
        {
            // Set the value of the editing control to the current cell value.
            base.InitializeEditingControl(rowIndex, initialFormattedValue,
                dataGridViewCellStyle);
            CalendarEditingControl ctl =
                DataGridView.EditingControl as CalendarEditingControl;
            // Use the default row value when Value property is null.
            if (this.Value == null)
            {
                ctl.NValue = (DateTime?)this.DefaultNewRowValue;
            }
            else
            {
                try { ctl.NValue = (DateTime)this.Value; } catch (Exception) { ctl.NValue = (DateTime?)this.DefaultNewRowValue; }
            }
        }
        public override Type EditType
        {
            get
            {
                // Return the type of the editing control that CalendarCell uses.
                return typeof(CalendarEditingControl);
            }
        }
        public override Type ValueType
        {
            get
            {
                // Return the type of the value that CalendarCell contains.
                return typeof(DateTime);
            }
        }
        public override object DefaultNewRowValue
        {
            get
            {
                // Use the current date and time as the default value.
                return null;
            }
        }
    }
    class CalendarEditingControl : DateTimePicker, IDataGridViewEditingControl
    {
        DataGridView dataGridView;
        private bool valueChanged = false;
        int chType = 0;
        int rowIndex;
        private DateTime? val = null;
        public DateTime? NValue
        {
            get { return val; }
            set
            {
                val = value;
                chType = 1;
                DateTime t = DateTime.Now;
                try { t = (DateTime)val; }
                catch (Exception) { }
                chType = 0;
            }
        }

        public CalendarEditingControl()
        {
            this.Format = DateTimePickerFormat.Short;
            this.ValueChanged += CalendarEditingControl_ValueChanged;
        }
        void CalendarEditingControl_ValueChanged(object sender, EventArgs e)
        {
            if (chType == 0)
                val = this.Value;
        }
        // Implements the IDataGridViewEditingControl.EditingControlFormattedValue 
        // property.
        public object EditingControlFormattedValue
        {
            get
            {
                return this.Value.ToShortDateString();
            }
            set
            {
                if (value is String)
                {
                    try
                    {
                        // This will throw an exception of the string is 
                        // null, empty, or not in the format of a date.
                        this.Value = DateTime.Parse((String)value);
                    }
                    catch
                    {
                        // In the case of an exception, just use the 
                        // default value so we're not left with a null
                        // value.
                        this.Value = DateTime.Now;
                    }
                }
            }
        }
        // Implements the 
        // IDataGridViewEditingControl.GetEditingControlFormattedValue method.
        public object GetEditingControlFormattedValue(
            DataGridViewDataErrorContexts context)
        {
            return EditingControlFormattedValue;
        }
        // Implements the 
        // IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.
        public void ApplyCellStyleToEditingControl(
            DataGridViewCellStyle dataGridViewCellStyle)
        {
            this.Font = dataGridViewCellStyle.Font;
            this.CalendarForeColor = dataGridViewCellStyle.ForeColor;
            this.CalendarMonthBackground = dataGridViewCellStyle.BackColor;
        }
        // Implements the IDataGridViewEditingControl.EditingControlRowIndex 
        // property.
        public int EditingControlRowIndex
        {
            get
            {
                return rowIndex;
            }
            set
            {
                rowIndex = value;
            }
        }
        // Implements the IDataGridViewEditingControl.EditingControlWantsInputKey 
        // method.
        public bool EditingControlWantsInputKey(
            Keys key, bool dataGridViewWantsInputKey)
        {
            // Let the DateTimePicker handle the keys listed.
            switch (key & Keys.KeyCode)
            {
                case Keys.Left:
                case Keys.Up:
                case Keys.Down:
                case Keys.Right:
                case Keys.Home:
                case Keys.End:
                case Keys.PageDown:
                case Keys.PageUp:
                    return true;
                default:
                    return !dataGridViewWantsInputKey;
            }
        }
        // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit 
        // method.
        public void PrepareEditingControlForEdit(bool selectAll)
        {
            // No preparation needs to be done.
        }
        // Implements the IDataGridViewEditingControl
        // .RepositionEditingControlOnValueChange property.
        public bool RepositionEditingControlOnValueChange
        {
            get
            {
                return false;
            }
        }
        // Implements the IDataGridViewEditingControl
        // .EditingControlDataGridView property.
        public DataGridView EditingControlDataGridView
        {
            get
            {
                return dataGridView;
            }
            set
            {
                dataGridView = value;
            }
        }
        // Implements the IDataGridViewEditingControl
        // .EditingControlValueChanged property.
        public bool EditingControlValueChanged
        {
            get
            {
                return valueChanged;
            }
            set
            {
                valueChanged = value;
            }
        }
        // Implements the IDataGridViewEditingControl
        // .EditingPanelCursor property.
        public Cursor EditingPanelCursor
        {
            get
            {
                return base.Cursor;
            }
        }
        protected override void OnValueChanged(EventArgs eventargs)
        {
            // Notify the DataGridView that the contents of the cell
            // have changed.
            valueChanged = true;
            this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
            base.OnValueChanged(eventargs);
        }
    }
}

Все работает более или менее. Если выбираю другую дату, то норм записывает. А если нужна текущая дата, то при ее выборе поле пустое. Для того чтобы текущую дату выбрать, надо сначала другую, затем уже нужную.

Посмотрите код пожалуйста, где это можно исправить?