WinForms TextBox to accept numbers in a range

Sometime back, I was looking for a TextBox control which can silently accept numbers (positive int only) for a given range (minimum and maximum). I implemented the following simple class to achieve this:

class NumberTextBox : System.Windows.Forms.TextBox
{
   private string mPrevious;
   private int mMin;
   private int mMax;

   public NumberTextBox() : this(0, Int32.MaxValue) { }
   public NumberTextBox(int min, int max)
      : base()
   {
      if ((min > max) || min < 0 || max < 0)
      {
         throw new Exception("Minimum and maximum values are not supported");
      }
      mMin = min;
      mMax = max;
      this.Text = min.ToString();
   }

   protected override void OnKeyPress(KeyPressEventArgs e)
   {
      mPrevious = this.Text;
      e.Handled = !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar);
   }

   protected override void OnTextChanged(EventArgs e)
   {
      if (this.Text == string.Empty)
      {
         return;
      }

      int num;
      if (Int32.TryParse(this.Text, out num))
      {
         if (num > mMax)
         {
            this.Text = mPrevious;
            this.Select(this.Text.Length, 0);
         }
      }
      else
      {
         this.Text = mPrevious;
         this.Select(this.Text.Length, 0);
      }
   }

   protected override void OnLeave(EventArgs e)
   {
      int num;
      if (!Int32.TryParse(this.Text, out num) || num < mMin || num > mMax)
      {
         this.Text = mPrevious;
         // To move the cursor at last
         this.Select(this.Text.Length, 0);
      }
   }
}

To use this NumberTextBox on your dialog/form, include the above class in the project and replace TextBox with NumberTextBox in your form.