Difference between destructor, dispose and finalize method

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Destructor implicitly calls the Finalize method, they are technically the same. Dispose is available with objects that implement the IDisposable interface.

You may see : Destructors C# – MSDN

The destructor implicitly calls Finalize on the base class of the
object.

Example from the same link:

class Car
{
    ~Car()  // destructor
    {
        // cleanup statements...
    }
}

The Destructor’s code is implicitly translated to the following code:

protected override void Finalize()
{
    try
    {
        // Cleanup statements...
    }
    finally
    {
        base.Finalize();
    }
}

Your understanding for the Destructor is right:

From MSDN

The programmer has no control over when the destructor is called
because this is determined by the garbage collector. The garbage
collector checks for objects that are no longer being used by the
application. If it considers an object eligible for destruction, it
calls the destructor (if any) and reclaims the memory used to store
the object. Destructors are also called when the program exits. It is
possible to force garbage collection by calling Collect, but most of
the time, this should be avoided because it may create performance
issues.

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