C#

void TxtRegisteringKeyKeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
  char[] myNum = new char[11] { '0' , '1', '2', '3', '4', '5', '6', '7', '8', '9', '\b' };
  bool blnNumFnd = false;
  foreach (char c in myNum)
  {
     if (e.KeyChar == c)
        blnNumFnd = true;	
  } 
  if (!blnNumFnd)
      e.KeyChar = '\0';
}

private string myName;
public string GetName
{
  get
  {
    return this.myName;
  }
  set
  {
    this.myName = value;
  }
}

public Employee GetPerson(int Id)
{
    return empObj(Id);
}

public Employee this[int id]
{
    get
    {
        return this.personArray[id];
    }
}