Trying to use a Predicate to extract certain data into a list C#

I have an instance that contains a List that contains a set of records. I have created another instance of this list where I only want to pull out the active records, but this is the error it throws:

Message=Unable to cast object of type ‘WhereListIterator1[Namespace.Class]' to type 'System.Collections.Generic.List1[Namespace.Class]’.

Here is my code

public async Task CompareList(List<ListClass> listInstance1)
{
    List<ListClass> listInstance2 = new List<ListClass>();
    listInstance2 = (List<ListClass>)listInstance1.Where(x => x.Active == "A");
}

>Solution :

the problem in your code is that you try to cast IEnumerable<T> to List<T>

you have two options, either use .ToList() as suggested in the other answer, or pass the filtered list as a parameter to construct a new list as shown in the following code:

public async Task CompareList(List<ListClass> listInstance1)
{
 List<ListClass> listInstance2 = new(listInstance1.Where(x => x.Active == "A"));
}