[c#] C# string does not contain possible?

This is what I have going on. I have a crawler that reads html, and i'm looking to know when it does not contain two strings. For example.

string firstString = "pineapple"
string secondString = "mango"

string compareString = "The wheels on the bus go round and round"

So basically I want to know when the first string and second string are not in the compareString.

Thanks for all the help!

This should do the trick for you.

For one word:

if (!string.Contains("One"))

For two words:

if (!(string.Contains("One") && string.Contains("Two")))

Option with a regexp if you want to discriminate between Mango and Mangosteen.

var reg = new Regex(@"\b(pineapple|mango)\b", 
                       RegexOptions.IgnoreCase | RegexOptions.Multiline);
   if (!reg.Match(compareString).Success)
      ...

bool isFirst = compareString.Contains(firstString);
bool isSecond = compareString.Contains(secondString );

So you can utilize short-circuiting:

bool containsBoth = compareString.Contains(firstString) && 
                    compareString.Contains(secondString);

Use Enumerable.Contains function:

var result =
    !(compareString.Contains(firstString) || compareString.Contains(secondString));