Windows DataGridColumns User Controls

using System;
using System.Data;
using System.Windows.Forms;
using System.Drawing;

namespace RamiSaad
{
	/// <summary>
	/// Summary description for DataGridTimePickerColumn.
	/// This class builds the DateTimePicker column user control for datagrids for windows application. 
	/// It inherits DataGridTextBoxColumn, since this is already an available control in the .Net Framework.
	/// What needs to be modified, depending on the application, is the ValueChanged event. 
	/// To use this class, simply add it to the project, construct an instance, and use its properties.
	/// this is a sample usage:
	/// 
	///	DataGridTimePickerColumn col3=new DataGridTimePickerColumn();
	///	dataGrid1.TableStyles[0].GridColumnStyles.Add(col3);
	///	dataGrid1.TableStyles[0].GridColumnStyles[7].MappingName="Date Time";
	///	dataGrid1.TableStyles[0].GridColumnStyles[7].HeaderText="Date Time";
	///	dataGrid1.TableStyles[0].GridColumnStyles[7].Width=100;
	///	
	/// </summary>
	public class DataGridTimePickerColumn : DataGridTextBoxColumn//DataGridColumnStyle 
	{
		private DateTimePicker myDateTimePicker = new DateTimePicker();
		// The isEditing field tracks whether or not the user is
		// editing data with the hosted control.
		private bool isEditing;

		public DataGridTimePickerColumn() : base() 
		{
			myDateTimePicker.Visible = false;
		}

		protected override void Abort(int rowNum)
		{
			isEditing = false;
			myDateTimePicker.ValueChanged -= 
				new EventHandler(TimePickerValueChanged);
			Invalidate();
		}

		protected override bool Commit
			(CurrencyManager dataSource, int rowNum) 
		{
			myDateTimePicker.Bounds = Rectangle.Empty;
         
			myDateTimePicker.ValueChanged -= 
				new EventHandler(TimePickerValueChanged);

			if (!isEditing)
				return true;

			isEditing = false;

			try 
			{
				DateTime value = myDateTimePicker.Value;
				SetColumnValueAtRow(dataSource, rowNum, value);
			} 
			catch (Exception) 
			{
				Abort(rowNum);
				return false;
			}

			Invalidate();
			return true;
		}

		protected override void Edit(
			CurrencyManager source, 
			int rowNum,
			Rectangle bounds, 
			bool readOnly,
			string instantText, 
			bool cellIsVisible) 
		{
			DateTime value = (DateTime.Parse(GetColumnValueAtRow(source, rowNum).ToString());
			if (cellIsVisible) 
			{
				myDateTimePicker.Bounds = new Rectangle
					(bounds.X + 2, bounds.Y + 2, 
					bounds.Width - 4, bounds.Height - 4);
				myDateTimePicker.Value = value;
				myDateTimePicker.Visible = true;
				myDateTimePicker.ValueChanged += 
					new EventHandler(TimePickerValueChanged);
			} 
			else 
			{
				myDateTimePicker.Value = value;
				myDateTimePicker.Visible = false;
			}

			if (myDateTimePicker.Visible)
				DataGridTableStyle.DataGrid.Invalidate(bounds);
		}

		protected override Size GetPreferredSize(
			Graphics g, 
			object value) 
		{
			return new Size(100, myDateTimePicker.PreferredHeight + 4);
		}

		protected override int GetMinimumHeight() 
		{
			return myDateTimePicker.PreferredHeight + 4;
		}

		protected override int GetPreferredHeight(Graphics g, 
			object value) 
		{
			return myDateTimePicker.PreferredHeight + 4;
		}

		protected override void Paint(Graphics g, 
			Rectangle bounds, 
			CurrencyManager source, 
			int rowNum) 
		{
			Paint(g, bounds, source, rowNum, false);
		}
		protected override void Paint(
			Graphics g, 
			Rectangle bounds,
			CurrencyManager source, 
			int rowNum,
			bool alignToRight) 
		{
			Paint(
				g,bounds, 
				source, 
				rowNum, 
				Brushes.Red, 
				Brushes.Blue, 
				alignToRight);
		}
		protected override void Paint(
			Graphics g, 
			Rectangle bounds,
			CurrencyManager source, 
			int rowNum,
			Brush backBrush, 
			Brush foreBrush,
			bool alignToRight) 
		{
			DateTime date = DateTime.Parse(GetColumnValueAtRow(source, rowNum).ToString());
			Rectangle rect = bounds;
			g.FillRectangle(backBrush,rect);
			rect.Offset(0, 2);
			rect.Height -= 2;
			g.DrawString(date.ToString("d"), 
				this.DataGridTableStyle.DataGrid.Font, 
				foreBrush, rect);
		}

		protected override void SetDataGridInColumn(DataGrid value) 
		{
			base.SetDataGridInColumn(value);
			if (myDateTimePicker.Parent != null) 
			{
				myDateTimePicker.Parent.Controls.Remove 
					(myDateTimePicker);
			}
			if (value != null) 
			{
				value.Controls.Add(myDateTimePicker);
			}
		}

		private void TimePickerValueChanged(object sender, EventArgs e) 
		{
			this.isEditing = true;
			base.ColumnStartedEditing(myDateTimePicker);
		}
	}
}