Data Driven Test doesn't work in coded UI

Question

Hi,
I have written my first coded ui data driven test (Visual Studio 2012).  Although the test ran and was marked passed. I don't think it actually did anything.  
I have 2 fields (Input and Output) on my csv file.
n my app,  I want to enter the input field in a field called GoTo which is an UITbedit field, hit enter.  This should open another window where I want to validate the window title = to my Output 
Here is my code
        [DataSource("Microsoft.VisualStudio.TestTools.DataSource.CSV", "|DataDirectory|\\Data/MainData.csv", "MainData#csv", DataAccessMethod.Sequential), DeploymentItem("MainData.csv"), TestMethod]
        public void DataDrivenTest()
            //string paramVal = TestContext.DataRow["Input"];
            this.UIMap.EnterGoToValueMainParams.TextInputEditText =
                TestContext.DataRow["Input"].ToString();
    this.UIMap.EnterGoToValueMain();
            this.UIMap.PressEnter();
            this.UIMap.AssertWindowTitleExpectedValues.TextOutputEditText =
                TestContext.DataRow["Output"].ToString();
During playback, it appeared that the coded ui test had looped through the csv file, but it didn't actually write anything to the edit field that I was testing.

Answer 1

It still doesn't work,
I modified my code as follows:
            this.UIMap.EnterGoToValueMainParams.TextInputEditText =
                   TestContext.DataRow["Input"].ToString();
            this.UIMap.EnterGoToValueMain();
            this.UIMap.PressEnter();
            this.UIMap.AssertWindowTitleExpectedValues.TextOutputEditText =
                   TestContext.DataRow["Output"].ToString();
            this.UIMap.AssertWindowTitle();
The application appears to loop through the file, but it is placing my original entered test "1" in the edit field during both iterations.  The playback is slow enough that I can see what is being entered. It doesn't seem to be replacing the
"1" with a "5" from my input file.