Comparision of string value in asp.net

I have some to do some comarison onthe text file  so i display the TEXT file into the textbox and second TEXT file in to the Second Textbox  and afetr that i compare both file         

string testString1 = TextBox1.Text.ToString();

        string testString2 = TextBox2.Text.ToString();

        int result = string.Compare(testString1, testString2);

        Label1.Text = result.ToString();