code/Controls/ControlExtensions.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Sylloge.Controls
{
    #region Windows Form Extensions

    public class ListBox : System.Windows.Forms.ListBox
    {
        private delegate void DelegateAddMessage(object item);

        public bool AutoScroll { get; set; }

        public void Add(object item)
        {
            try {
                if (this.InvokeRequired) {
                    this.Invoke(new DelegateAddMessage(this.Add), new object[] { item });
                } else {
                    this.Items.Add(item);
                    if (this.AutoScroll) {
                        try {
                            this.SelectedIndex = this.Items.Count - 1;
                        } catch (Exception ex) {
                            Console.WriteLine(ex.Message);
                        }
                    }
                }
            } catch (Exception ex) {
                Console.WriteLine(ex.Message);
            }
        }

        public new void RefreshItem(int index)
        {
            base.RefreshItem(index);
        }
    }

    public class Textbox : System.Windows.Forms.TextBox
    {
        public enum TextboxType
        {
            Default,
            Numeric,
            AlphaNumeric
        }

        public TextboxType Type { get; set; }

        public bool AutoScroll { get; set; }

        public Textbox()
            : base()
        {
            base.TextChanged += new EventHandler(this.Textbox_TextChanged);
            base.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Textbox_KeyPress);
        }

        private void Textbox_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            // A handler for the input, you can still hook into your own handler
            // if you implement this extension
            switch (this.Type) {
                case TextboxType.AlphaNumeric: // Letters/Numbers
                    e.Handled = !char.IsLetterOrDigit(e.KeyChar) && !char.IsControl(e.KeyChar);
                    break;
                case TextboxType.Numeric: // Numeric only
                    e.Handled = !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar);
                    break;
            }
        }

        private void Textbox_TextChanged(object sender, EventArgs e)
        {
            if (this.AutoScroll) {
                this.Select(this.Text.Length, 0);
                this.ScrollToCaret();
            }
        }
    }

    #endregion
}