/// <summary>
/// Return guard1 and guard2
/// </summary>
/// <param name="guard1"></param>
/// <param name="guard2"></param>
/// <returns></returns>
public static Expression CombineGuard(Expression guard1, Expression guard2)
{
if (guard1 != null && guard2 != null)
{
return(Expression.AND(guard1, guard2));
}
else if (guard1 == null)
{
return(guard2);
}
else
{
return(guard1);
}
}