C# | Check if an element is in the Collection<T>

Collection<T>.Contains(T) method is used to determine whether an element is in the Collection<T>. Syntax:

public bool Contains (T item);

Here, item is the object to locate in the Collection<T>. The value can be null for reference types. Return Value: This method return True if item is found in the Collection<T>, otherwise, False. Below given are some examples to understand the implementation in a better way: Example 1: Output:

True

Example 2:

Output:

False

Note: This method performs a linear search. Therefore, this method is an O(n) operation, where n is Count. Reference:

• https://learn.microsoft.com/en-us/dotnet/api/system.collections.objectmodel.collection-1.contains?view=netframework-4.7.2