DeleteAllCookies() doesn't work

[pashidlos]

HI!
I'm trying to delete cookies after each test and added it to [TearDown]

[TestFixture]
public class CartTests : FluentTest
{

    [TestFixtureSetUp]
    public void SampleTests()
    {
        new DriverSetup();
    }

    [TearDown]
    public void TearDown()
    {
        this.Provider.Manage().Cookies.DeleteAllCookies();
    }

But after on test is completed another begins with without clearing cookies.
Maybe I'm doing something wrong?
Please, help me