How to check if a string not exist in all array elements

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C#

string

I have an array of string and I want to see if an element of it not contained in another string, so dont call the function named onefive in my code below input1 array of string while s1 string. the code works but my problem I dont want if (wo) is a substring from s1 but just if whole string for instance suppose that:

input1={info, text, car};
s1="information carrot";

the function (onefive) will not be called in first element info and the third element car because info is a substring from information and car is a substring from carrot but I dont want that!

please I need help but without using Regex because it dosent work in my language!

What I have tried:

foreach (string wo in input1)
            {
                if (!s1.Contains(wo))
                {
                    zo = zo+onefive(wo);
                    
                }
            }