How to run test one after the other? Selenium+NUnit C#

I have problem with running test. I have one test with testCaseSource(three testCase) and now then I click to run test, they run together. I want them to run one after the other, is it possible?

static object[] TestData =
{
        new object[] {"sssssssssssss"},
        new object[] {"qwqwe"},
        new object[] {"aaaaaaaaaaaaa"}
    };
    [SetUp]
    public void Initialize()
    {
        driver.Navigate().GoToUrl("http://www.google.lt");
    }


    [Test,TestCaseSource("TestData"),]
    public void TestMethod(string a)
    {
        IWebElement element = driver.FindElement(By.Name("q"));
        element.SendKeys(a);
    }

    [TearDown]
    public void Close()
    {
        driver.Close();
    }