title: Cleanup data for every test iteration
body: <p>I create Visual Studio 2012 Test Project. I test some web application with data in grid. 
  First I created Test Method for delete data from the grid. For the first time I run the test it works correctly. The next time when I run my test method the test fails.
  Is there some line of code which adds value in the grid every time before I run my delete test method?
  Also I have Edit and Add method. The same question for those actions.First time editing data works fine but the next test fails. First I add data in the grid test success but the next run says that is duplicate.
  Can somebody suggest me some instructions or another site where it is done.</p>