/// <summary>
/// Adds two cells together for LONG and DOUBLE, concatentates strings, returns null otherwise
/// </summary>
/// <param name="C1">Left cell</param>
/// <param name="C2">AWValue cell</param>
/// <returns>Cell result</returns>
public static Cell operator +(Cell C1, Cell C2)
{
return(CellOperations.Add(C1, C2));
}