How is memory released occupied by classes in managed programming languages?

In managed programming languages such as C#, memory occupied by class objects is automatically released by the garbage collector (GC).

The garbage collector tracks objects in memory and determines which ones are no longer in use (no references to them from active code). Such objects are considered garbage, and their memory is freed.

Key points:

• Developers do not manually manage memory as in C++.
• Objects with no references are subject to collection.
• GC runs in the background, periodically cleaning up unused objects.
• For releasing non-memory resources (e.g., files, connections), the IDisposable interface and the Dispose() method are used, which can be called manually or via the using statement.

Example of using IDisposable:

class ResourceHolder : IDisposable
{
    private FileStream fileStream;

    public ResourceHolder(string filePath)
    {
        fileStream = new FileStream(filePath, FileMode.Open);
    }

    public void Dispose()
    {
        fileStream?.Dispose();
    }
}

// Usage
using(var resource = new ResourceHolder("file.txt"))
{
    // Work with the resource
}
// Dispose is called automatically after exiting the using block

Thus, memory is released automatically, and managed resources are released via Dispose.