CSharp NumericTextBox control

I've post here a simple custom control that it accepts only numeric input.
The only one methods in the OnKeyPress (overrided) and accept only digit or the backspace

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

using DrLuiji.Controls
{
public class NumericTextBox : TextBox
{     
  protected override void OnKeyPress(KeyPressEventArgs e)
  {
      base.OnKeyPress(e); 
      if (!((Char.IsDigit(e.KeyChar))||(e.KeyChar.Equals('\b'))))
      {         
          e.Handled = true;     
          ErrorBeep();
      }
 }
    public void ErrorBeep()
 {
           //Console.Beep();
 }
}
}

To use it you just drag & drop the control from the toolbox to your form.

Have fun.

Retrieve system folder c#

Here you can find a way to retrieve the system folder.
Very simple, call the System.Environment.GetFolderPath with the corrisponding enum System.Environment.SpecialFolder.See the sample below.

private string GetSystemSpecialFolderDirectory()
{
//Program files
string sProgramFilesFolder = System.Environment.GetFolderPath(
System.Environment.SpecialFolder.ProgramFiles);

//Personal
string sPersonalFolder = System.Environment.GetFolderPath (
System.Environment.SpecialFolder.Personal);

//Desktop
string sDesktopFolder = System.Environment.GetFolderPath(
System.Environment.SpecialFolder.DesktopDirectory);

//Application Data
string sApplicationDataFolder = System.Environment.GetFolderPath(
System.Environment.SpecialFolder.ApplicationData);

//System:
string sSystemFolder = System.Environment.GetFolderPath(
System.Environment.SpecialFolder.System);


MessageBox.Show("Program files: " + sProgramFilesFolder +
"\r\nPersonal: " + sPersonalFolder +
"\r\nDesktop: " + sDesktopFolder +
"\r\nApplication Data: " + sApplicationDataFolder +
"\r\nSystem: " + sSystemFolder);
}

Very simple isn't it ?