how to use nunitasp for comparing two objects and to find the length of objects ?

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ASP.NET4

Hi,
I am working on Test-Driven Development with NUnitAsp . I am having a webapplication project to test . In My test project i need to write a test method to compare the strings in two textbox . How is it Possible with AssertEquals ?? My Aim is if the input values in two textbox is same test should fail if not test should pass ......... 2) The length of the textbox elements should be less than 10..... The code which i tried is below

 public void TestLayout()
{
 name = new TextBoxTester("name", CurrentWebForm);
 comments = new TextBoxTester("comments", CurrentWebForm);
 save = new ButtonTester("save", CurrentWebForm);
 book = new DataGridTester("book", CurrentWebForm);

 Browser.GetPage("http://localhost:49786/GuestBook.aspx");
 SignGuestBook("ABC", "DEF!");

       string[][] expected = new string[][]
         {
                 new string[] {"ABC", "DEF!"},

         };
       AssertEquals("book", expected, book.TrimmedCells);
}

private void SignGuestBook(string nameToSign, string commentToSign)
   {
       name.Text = nameToSign;
       comments.Text = commentToSign;
       save.Click();
   }