CODE EXAMPLE FOR CSHARP

c# contains

public bool Contains (char value);
public bool Contains (string value);
public bool Contains (char value, StringComparison comparisonType);
public bool Contains (string value, StringComparison comparisonType);

//ex
string s1 = "The quick brown fox jumps over the lazy dog";
string s2 = "fox";
bool b = s1.Contains(s2);