Method to check array list containing specific string

I have an ArrayList that import records from a database. Is there any method to check whether the arrayList contains schname that i want to match to another list which is an api?

List<PrimaryClass> primaryList = new List<PrimaryClass>(e.Result);
PrimaryClass sc = new PrimaryClass();
foreach (string item in str)
{
    for (int a = 0; a <= e.Result.Count - 1; a++)
    {
        string schname = e.Result.ElementAt(a).PrimarySchool;
        string tophonour = e.Result.ElementAt(a).TopHonour;
        string cca = e.Result.ElementAt(a).Cca;
        string topstudent = e.Result.ElementAt(a).TopStudent;
        string topaggregate = e.Result.ElementAt(a).TopAggregate;
        string topimage = e.Result.ElementAt(a).TopImage;        
        if (item.Contains(schname))
        {
        }
    }
}

This is what I have come up with so far, kindly correct any errors that I might have committed. Thanks.