C#

InitPropellent((long)this.Handle, false, "");

• Use an array, as you did. If you do this, check for the length when the array is changed:
  
  C#

  set
  {
      if (value.Length == 3)
      {
          request = value;
      }
      else
      {
          throw new Exception("Length of Request must be 3.");
      }
  }

  
  
• Use a Tuple: http://msdn.microsoft.com/en-us/library/system.tuple%28v=vs.110%29.aspx[^]
  
  C#

  private Tuple<char, char, char> request;
  
  public Package()
  {
      request = new Tuple<char, char, char>('\0', '\0', '\0');
  }
  
  public Tuple<char, char, char> Request
  {
      get { return request; }
      set { request = value; }
  }

  
  Items in the Tuple can be accessed like Request.Item1, Request.Item2, Request.Item3.
  
• As properties in your class. Personally, I wouldn't use this unless it is really necessary for some reason.
  
  C#

  private char _char1;
  private char _char2;
  private char _char3;
  
  public Package()
  {
      _char1 = _char2 = _char3 = '\0';
  }
  
  public char Char1
  {
      get { return _char1; }
      set { _char1 = value; }
  }
  // and so on

TMattC wrote:

Can it be done with an automatic property

private char[] CharProp { set; get; }

private void TestCharProp()
{
    CharProp = new char[3] {'a', 'b', 'c'};

    char value2 = (char) CharProp.GetValue(2);
    
    CharProp.SetValue('x',2);
}

theFileContents = File.ReadAllLines(thePath); 

public void ChangeIt(ref int x) { x += 1; }

    ...
    int[] aArray = Enumerable.Range(1, 50).ToArray();

    ChangeIt(ref aArray[3]);

    int[] arr = Enumerable.Range(1, 50).ToArray();
    ChangeIt(arr);
    ...

public void ChangeIt(int[] arr)
    {
    for (int i = 0; i < arr.Length; i++)
        {
        arr[i]++;
        }
    }