>>>Hi,
>>>
>>>I need to check if a string is within another string. Here is an example:
>>>
>>>

>>> if (!LongString.Contains(ShortString))
>>>    {
>>>           // do something
>>>    }
>>>

>>>
>>>The problem I have is when the short string (ShortString) is empty (""), "do something" never does anything. Of course I can get around the problem by adding to the IF ShortString.Length = 0 || . But I was wondering, can I change the .Contains somehow to make it work with empty string?
>>
>>Nothing you can do about how 'Contains' works. Maybe :

if (string.IsNullOrEmpty(ShortString) || !LongString.Contains(ShortString))

or you could get fancy and write your own extension method :-}
>
>This is what I thought when I said to add to the IF the expression checking for empty ShortString. And if you confirm that this is the optimal solution, then it is good enough for me.

If you need it a lot then:

public static bool DoesNotContain(this String str, string shortString)
        {
            return string.IsNullOrEmpty(shortString) || !str.Contains(shortString);
        }

then:

            if (LongString.DoesNotContain(ShortString))
            {
                //
            }