I suppose you want to read the parameters from the datasource of the Test Case that your automated test implements.
You have to associate your test with the Test Case's Id on TFS.
Try the following code.
[TestClass]
public class TestClass
{
public TestContext TestContext { get; set; }
public DataRow DataRow { get; set; }
[TestMethod]
[DataSource("Microsoft.VisualStudio.TestTools.DataSource.TestCase",
"http://localhost:8080/tfs/[CollectionName];[ProjectName]", "[TestCaseId]", DataAccessMethod.Sequential)]
public void TestMethod()
{
string column1 = TestContext.DataRow[0].ToString(); // read parameter by column index
string column2 = TestContext.DataRow["Column2"].ToString(); //read parameter by column name
}
}
Have in mind that your TestMethod will run one time for each row (iteration) of the Test Case's datasource.