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Recall that a stored procedure is a named block of SQL code stored in the database. You can construct stored procedures so they return a set of rows or scalar data types or do anything else that makes sense (e.g., insert, update, or delete); you can also have them take any number of optional parameters. The end result is a unit of work that behaves like a typical function, except that it is located on a data store rather than a binary business object. Currently, your AutoLot database defines a single stored procedure named GetPetName, which you formatted as follows: GetPetName @carID int, @petName char(10) output

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AS SELECT @petName = PetName from Inventory where CarID = @carID Now consider the following final method of the InventoryDAL type, which invokes your stored procedure: public string LookUpPetName(int carID) { string carPetName = string.Empty; // Establish name of stored proc. using (SqlCommand cmd = new SqlCommand("GetPetName", this.sqlCn)) { cmd.CommandType = CommandType.StoredProcedure; // Input param. SqlParameter param = new SqlParameter(); param.ParameterName = "@carID"; param.SqlDbType = SqlDbType.Int; param.Value = carID; // The default direction is in fact Input, but to be clear: param.Direction = ParameterDirection.Input; cmd.Parameters.Add(param); // Output param. param = new SqlParameter(); param.ParameterName = "@petName"; param.SqlDbType = SqlDbType.Char; param.Size = 10; param.Direction = ParameterDirection.Output; cmd.Parameters.Add(param); // Execute the stored proc. cmd.ExecuteNonQuery(); // Return output param. carPetName = (string)cmd.Parameters["@petName"].Value; } return carPetName; } One important aspect of invoking a stored procedure is to keep in mind that a command object can represent a SQL statement (the default) or the name of a stored procedure. When you wish to inform a command object that it will be invoking a stored procedure, you pass in the name of the procedure (as a constructor argument or by using the CommandText property) and must set the CommandType property to the value CommandType.StoredProcedure (if you fail to do this, you will receive a runtime exception because the command object is expecting a SQL statement by default): SqlCommand cmd = new SqlCommand("GetPetName", this.sqlCn); cmd.CommandType = CommandType.StoredProcedure;

ASP.NET ships with a provider for SQL Server and Active Directory (which enables you to create custom login pages for users stored in Active Directory). But the idea of providers is that they give you the ability to completely extend the infrastructure. Therefore, you can write your own membership provider, which is basically a class that inherits from System.Web.Security.MembershipProvider. Membership providers are primarily configured through your web.config configuration file, which includes a new <membership /> section. You will learn more about custom membership providers in 26.

Next, notice that the Direction property of a parameter object allows you to specify the direction of travel for each parameter passed to the stored procedure (e.g., input parameter, output parameter, in/out parameter, or return value). As before, you add each parameter object to the command object s parameters collection: // Input param. SqlParameter param = new SqlParameter(); param.ParameterName = "@carID"; param.SqlDbType = SqlDbType.Int; param.Value = carID; param.Direction = ParameterDirection.Input; cmd.Parameters.Add(param); After the stored procedure completes with a call to ExecuteNonQuery(), you can obtain the value of the output parameter by investigating the command object s parameter collection and casting accordingly: // Return output param. carPetName = (string)cmd.Parameters["@petName"].Value; At this point, your initial iteration of the AutoLotDAL.dll data access library is complete! You can use this assembly to build any sort of front end to display and edit your data you want (e.g., console based, Windows Forms based, Windows Presentation Foundation based, or an HTML-based web application). You have not yet examined how to build graphical user interfaces, so next you will test your data library from a new console application.

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