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// Open the connection of the command command.Connection.Open(); // Execute the command and get the number of affected rows value = command.ExecuteScalar().ToString(); } catch (Exception ex) { // Log eventual errors and rethrow them Utilities.LogError(ex); throw ex; } finally { // Close the connection command.Connection.Close(); } // return the result return value; } The functionality in these two methods is similar to the one you wrote for ExecuteSelectCommand in 4, so we won t analyze them again here. The next step is to update CatalogAccess. Add these methods to your CatalogAccess class, inside CatalogAccess.cs: // Update department details public static bool UpdateDepartment(string id, string name, string description) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "UpdateDepartment"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@DepartmentId"; param.Value = id; param.DbType = DbType.Int32; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@DepartmentName"; param.Value = name; param.DbType = DbType.String; param.Size = 50; comm.Parameters.Add(param);

It may have occurred to you that you can return information such as the total number of items through a read-only property procedure (such as TotalItems) instead of a method (in this case, GetTotalItems). Though this does work, property procedures are better left to information that is maintained with the class (in a private variable) or is easy to reconstruct. In this case, it takes a database operation to count the number of rows, and this database operation can cause an unusual problem or slow down performance if used frequently. To help reinforce that fact, a method is used instead of a property.

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* The GetXXX() methods return a type corresponding to the request. For example, the GetString() method returns a string, and GetInt32() returns an integer. ** You must use the appropriate method for the type of object you want to retrieve. There are 37 different GetXXX() methods for the SqlDataReader and 25 for the OleDbDataReader and OdbcDataReader, so check the .NET documentation.

Using a dedicated database component is a great way to keep your code efficient and well-organized. It also makes it easy for you to apply changes later. However, this has a drawback namely, you need to write quite a bit of code to create a web page and a separate data-access component. In 14, you saw that you could simplify your life by using components such as the SqlDataSource to encapsulate all your data access details. Unfortunately, that code-free approach won t work if you re using a separate component or will it It turns out there is a way to get the best of both worlds and use a separate data-access component and easier web page data binding. Instead of using the SqlDataSource, you use the ObjectDataSource, which defines a link between your web page and your component. This won t save you from writing the actual data access code in your component, but it will save you from writing the tedious code in your web page to call the methods in your component, extract the data, format it, and display it in the page.

// create a new parameter param = comm.CreateParameter(); param.ParameterName = "@DepartmentDescription"; param.Value = description; param.DbType = DbType.String; param.Size = 1000; comm.Parameters.Add(param); // result will represent the number of changed rows int result = -1; try { // execute the stored procedure result = GenericDataAccess.ExecuteNonQuery(comm); } catch { // any errors are logged in GenericDataAccess, we ignore them here } // result will be 1 in case of success return (result != -1); } // Delete department public static bool DeleteDepartment(string id) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "DeleteDepartment"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@DepartmentId"; param.Value = id; param.DbType = DbType.Int32; comm.Parameters.Add(param); // execute the stored procedure; an error will be thrown by the // database if the department has related categories, in which case // it is not deleted int result = -1; try { result = GenericDataAccess.ExecuteNonQuery(comm); } catch {

Note The ObjectDataSource allows you to create code-free web pages, but you still need to write the

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