HexNumericUpdown.cs

using System;
using System.ComponentModel;
using System.Windows.Forms;


public class HexNumericUpdown : NumericUpDown
{
    public HexNumericUpdown()
    {
        base.Hexadecimal = true;
        base.Minimum = 0;
        base.Maximum = uint.MaxValue;
    }
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public new decimal Maximum
    {    // Doesn't serialize properly 
        get { return base.Maximum; }
        set { base.Maximum = value; }
    }
    protected override void UpdateEditText()
    {
        if (base.UserEdit) HexParseEditText();
        if (!string.IsNullOrEmpty(base.Text))
        {
            base.ChangingText = true;
            base.Text = string.Format("{0:X}", (uint)base.Value);
        }
    }
    protected override void ValidateEditText()
    {
        HexParseEditText();
        UpdateEditText();
    }
    private void HexParseEditText()
    {
        try
        {
            if (!string.IsNullOrEmpty(base.Text))
                this.Value = Convert.ToInt64(base.Text, 16);
        }
        catch { }
        finally
        {
            base.UserEdit = false;
        }
    }
}