Question

If I have a routine that can throw an ArgumentException in two places, something like…

if (Var1 == null)
{
    throw new ArgumentException ("Var1 is null, this cannot be!");
}

if (Val2  == null)
{
    throw new ArgumentException ("Var2 is null, this cannot be either!");
}

What’s the best way of determining in my calling procedure which of the two exceptions was thrown?

Or

Am I doing this in the wrong fashion?

Answer 1

Pass the name of the variable (Val1, Val2 etc) in the second argument to the ArgumentException constructor. This becomes the ArgumentException.ParamName property.