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Forms authentication includes the possibility of storing the password in different formats. In the <credentials /> configuration section, the format of the password is specified through the passwordFormat attribute, which has three valid values: Clear: The passwords are stored as clear text in the <user /> elements of the <credentials /> section. MD5: The hashed version of the password is stored in the <user /> elements, and the algorithm used for hashing the password is the MD5 hashing algorithm. SHA1: The <user /> elements in the <credentials /> section of the web.config file contain the hashed password, and the algorithm used for hashing the password is the SHA1 algorithm. When using the hashed version of the passwords, you have to write a tool or some code that hashes the passwords for you and stores them in the web.config file. For storing the password, you should then use the FormsAuthentication.HashPasswordForStoringInConfigFile method instead of passing in the clear-text password as follows: Dim hashedPwd As String = FormsAuthentication.HashPasswordForStoringInConfigFile(clearTextPassword, "SHA1") The first parameter specifies the clear-text password, and the second one specifies the hash algorithm you should use. The result of the method call is the hashed version of the password. If you want to modify users stored in web.config as shown previously, you have to use the configuration API of the .NET Framework. You cannot edit this section with the web-based configuration tool. The following code snippet shows how you can modify the section through the configuration API:

Inserting a new record into the Inventory table is as simple as formatting the SQL Insert statement (based on user input) and calling the ExecuteNonQuery() using your command object. You can see this in action by adding a public method to your InventoryDAL type named InsertAuto() that takes four parameters that map to the four columns of the Inventory table (CarID, Color, Make, and PetName). You use these arguments to format a string type to insert the new record. Finally, use your SqlConnection object to execute the SQL statement:

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Dim MyConfig As Configuration = WebConfigurationManager.OpenWebConfiguration("~/") Dim SystemWeb As ConfigurationSectionGroup = MyConfig.SectionGroups("system.web") Dim AuthSec As AuthenticationSection = CType(SystemWeb.Sections("authentication"), AuthenticationSection) AuthSec.Forms.Credentials.Users.Add (New FormsAuthenticationUser(UserText.Text, PasswordText.Text)) MyConfig.Save() Of course, only privileged users such as website administrators should be allowed to execute the previous code, and the process executing the code must have write access to your web.config file. Also, this sort of code should not be included in the actual web application. You should include it in an administration application only. You will learn more about hashing passwords in 25.

public void InsertAuto(int id, string color, string make, string petName) { // Format and execute SQL statement. string sql = string.Format("Insert Into Inventory" + "(CarID, Make, Color, PetName) Values" + "('{0}', '{1}', '{2}', '{3}')", id, make, color, petName); // Execute using our connection. using(SqlCommand cmd = new SqlCommand(sql, this.sqlCn)) { cmd.ExecuteNonQuery(); } } This method is syntactically fine, but you could supply an overloaded version that allows the caller to pass in a strongly typed class that represents the data for the new row. Define a new NewCar class, which represents a new row in the Inventory table: public class NewCar { public int CarID { get; set; } public string Color { get; set; } public string Make { get; set; } public string PetName { get; set; } } Now add the following version of InsertAuto() to your InventoryDAL class: public void InsertAuto(NewCar car) { // Format and execute SQL statement. string sql = string.Format("Insert Into Inventory" + "(CarID, Make, Color, PetName) Values" + "('{0}', '{1}', '{2}', '{3}')", car.CarID, car.Make, car.Color, car.PetName); // Execute using our connection. using (SqlCommand cmd = new SqlCommand(sql, this.sqlCn)) { cmd.ExecuteNonQuery(); } } Defining classes that represent records in a relational database is a common way to build a data access library. In fact, as you will see in 23, the ADO.NET Entity Framework automatically generates strongly typed classes that allow you to interact with database data. On a related note, the disconnected layer of ADO.NET (see 22) generates strongly typed DataSet objects to represent data from a given table in a relational database.

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