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//encrypt the ticket string crypt = FormsAuthentication.Encrypt(ticket); //add the encrypted cookie to the cookies collection of the form Response.Cookies.Add(new HttpCookie(FormsAuthentication.FormsCookieName, crypt)); Response.Redirect(FormsAuthentication.GetRedirectUrl(txtUsername.Text, true)); } else { Session["LoginAttemptCount"] = LoginCount + 1; lblLoginError.Visible = true; txtUsername.Text = ""; txtPassword.Text = ""; } } private bool ValidateUser(string Username, string Password) { string cnString = ConfigurationSettings.AppSettings["cnString"]; SqlParameter pUsername = new SqlParameter("@Username", SqlDbType.VarChar, 20); pUsername.Value = Username; SqlParameter pPassword = new SqlParameter("@Password", SqlDbType.VarChar, 20); pPassword.Value = Password; int UserID = (int)SqlHelper.ExecuteScalar(cnString, CommandType.StoredProcedure, "usp_VerifyUser", pUsername, pPassword); if(UserID != 0) { //Get the user's roles GetUserRoles(UserID); return true; } else { return false; } } private void GetUserRoles(int UserID) { string cnString = ConfigurationSettings.AppSettings["cnString"]; SqlParameter pUserID = new SqlParameter("@UserID", SqlDbType.Int); pUserID.Value = UserID; DataSet ds = new DataSet(); ds = SqlHelper.ExecuteDataSet(cnString, CommandType.StoredProcedure,

One of the advantages of HTML was that it was forgiving of sloppy or unplanned development XML does not forgive sloppy planning This can be seen as an advantage or a disadvantage A well-planned corporate data model implemented in a set of XML DTDs will provide dramatic increases in interoperability, communications, and data sharing Poor planning can result in miscommunications and loss of data through incompatible applications Someone once said, Computers are powerful tools for making more errors, more quickly, and more precisely That statement refers just as easily to XML Designers and developers must carefully analyze their needs so that XML is applied appropriately A developer can build models of the legacy data structures and map data models to a set of XML data elements The XML data elements are collected into a set of DTDs that can be used to build a well-defined tree structure for each document However, DTD development should not occur in a vacuum If a corporation tries to develop its own applications and DTDs, it may find that its development is incompatible with other companies, vendors, and partners Developers can avoid incompatibilities and standards wars by learning about the various industry standard DTDs The main advantage of XML will be for sharing data, so all companies will benefit by using the same standards Compromises can be made to ensure widespread and future interoperability These compromises may make XML documents larger or less fine-tuned than other solutions, but the increase in data sharing will be more than worth the trade-off

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"usp_GetUserRoles" , pUserID); StringBuilder b = new StringBuilder(); foreach(DataRow r in ds.Tables[0].Rows) { b.Append("~"); b.Append(r["role"]); } roles = b.ToString(); }

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Companies and industry leaders are collaborating to develop standardized DTDs to share information and to automate business processes For example, if Ford, GM, and DaimlerChrysler agree on a standard B2B e-commerce DTD with a set of rules for their procurement needs, then they could ensure that their partners, vendors, and customers could write compatible applications The interoperability that XML promises will become a reality as more and more companies develop industry-specific DTDs The focus across vertical industries such as electronics has been to define specific DTDs so businesses can exchange data Business-to-business e-com-

The main difference between the code in listing 9.6 and our previous example is that we are manually saving information to the authentication ticket (before this process was automated). We are also utilizing the FormsAuthentication class more than before. Let s walk through the code and explain what is happening. First, as in our earlier example, unauthenticated users are redirected to the login page, at which time they must enter their username and password to view the requested page. This time, however, when we make a call to the ValidateUser function to determine if a user has entered a correct username/password combination, a list of roles is retrieved by calling the GetUserRoles function. This retrieves whatever roles are assigned to a user in the UserRoles table in SQL Server and populates a module-level string variable called roles. Once the user has been authenticated (i.e., the ValidateUser function returns True) and roles for that user have been retrieved, the next step is to create our forms authentication ticket. When we create the FormsAuthenticationTicket object called ticket, we must pass several items into its constructor: Version Username IssueDate ExpirationDate IsPersisted UserData

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