Determines whether an element is in the ArrayList.
Assembly: mscorlib (in mscorlib.dll)
This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.
This method determines equality by calling Object.Equals.
Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the Equals and CompareTo methods of the item parameter on the objects in the collection.