Using C# to check if string contains a string in string array

Here's how:

if(stringArray.Any(stringToCheck.Contains))
/* or a bit longer: (stringArray.Any(s => stringToCheck.Contains(s))) */

This checks if stringToCheck contains any one of substrings from stringArray. If you want to ensure that it contains all the substrings, change Any to All:

if(stringArray.All(stringToCheck.Contains))

here is how you can do it:

string stringToCheck = "text1";
string[] stringArray = { "text1", "testtest", "test1test2", "test2text1" };
foreach (string x in stringArray)
{
    if (stringToCheck.Contains(x))
    {
        // Process...
    }
}

UPDATE: May be you are looking for a better solution.. refer to @Anton Gogolev's answer below which makes use of LINQ.

Try this:

No need to use LINQ

if (Array.IndexOf(array, Value) >= 0)
{
    //Your stuff goes here
}