C#

<br />
using System;<br />
using System.Drawing;<br />
using System.Drawing.Drawing2D;<br />
using System.Globalization;<br />
<br />
namespace System.Windows.Forms<br />
{<br />
   public class TextBoxDate : TextBox<br />
   {<br />
      private DateTime date;<br />
      private CultureInfo culture = CultureInfo.CurrentCulture;<br />
      private bool validDate = false;<br />
      private Brush backgroundBrush = new SolidBrush(SystemColors.Control);<br />
<br />
      public TextBoxDate()<br />
      {<br />
         //this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);<br />
         this.SetStyle(ControlStyles.UserPaint, true);<br />
         this.backgroundBrush = new HatchBrush(HatchStyle.DarkDownwardDiagonal, Color.FromArgb(255, 128, 128), this.BackColor);<br />
      }<br />
<br />
      public CultureInfo Culture<br />
      {<br />
         get<br />
         {<br />
            return this.culture;<br />
         }<br />
         set<br />
         {<br />
            this.culture = value;<br />
         }<br />
      }<br />
<br />
      public DateTime DateTime<br />
      {<br />
         get<br />
         {<br />
            return new DateTime(this.date.Year, this.date.Month, this.date.Day, this.culture.Calendar);<br />
         }<br />
      }<br />
<br />
      protected override void OnTextChanged(EventArgs e)<br />
      {<br />
         base.OnTextChanged(e);<br />
         Parse();<br />
      }<br />
<br />
      protected override void OnLeave(EventArgs e)<br />
      {<br />
         base.OnLeave(e);<br />
         if (this.Text != string.Empty && this.validDate)<br />
         {<br />
            this.Text = this.DateTime.ToString(this.culture.DateTimeFormat.ShortDatePattern, this.culture);<br />
         }<br />
      }<br />
<br />
      protected override void OnPaintBackground(PaintEventArgs pevent)<br />
      {<br />
         base.OnPaintBackground(pevent);<br />
         if (this.Text != string.Empty)<br />
         {<br />
            if (!this.validDate)<br />
            {<br />
               pevent.Graphics.FillRectangle(this.backgroundBrush, this.ClientRectangle);<br />
            }<br />
         }<br />
      }<br />
<br />
      private void Parse()<br />
      {<br />
         DateTime resultDate;<br />
<br />
         this.validDate = false;<br />
         if (DateTime.TryParse(this.Text, this.culture, DateTimeStyles.AllowWhiteSpaces, out resultDate))<br />
         {<br />
            this.date = resultDate;<br />
            this.validDate = true;<br />
         }<br />
         this.Invalidate();<br />
      }<br />
   }<br />
}