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The ExecuteNonQuery() method executes commands that don t return a result set, such as INSERT, DELETE, and UPDATE. The ExecuteNonQuery() method returns a single piece of information the number of affected records. Here s an example that uses a DELETE command by dynamically building a SQL string: Dim con As New SqlConnection(connectionString) Dim sql As String = "DELETE FROM Employees WHERE EmployeeID = " & empID.ToString() Dim cmd As New SqlCommand(sql, con) Try con.Open() Dim numAff As Integer = cmd.ExecuteNonQuery() HtmlContent.Text &= String.Format("<br />Deleted <b>{0}</b> record(s)<br />", numAff) Catch exc As SqlException HtmlContent.Text &= String.Format("<b>Error:</b> {0}<br /><br />", exc.Message) Finally con.Close() End Try

In this case, no matter what user accesses the application, and no matter what type of user-level security you use, the code will run under the account you ve set In the second scenario, the users must be authenticated by IIS The web-page code will then execute under the identity of the appropriate user You ll learn more about these options in 20..

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ASP .NET needs to store all the information of users, roles, and profiles somewhere. By default it stores the data in a SQL Server database. But the whole infrastructure is completely extensible through so-called custom providers. Membership, roles, and profile providers are components that are responsible for storing user, role, and profile information in a data store. While ASP.NET 2.0 ships with a profile for SQL Server, you can create and configure custom providers to store this information anywhere you want. Best of all, the whole API accesses these providers through welldefined interfaces, which means your application can be written completely provider independent. That means changing a provider will not affect your application in any way! You will learn more about custom providers in 26.

So far, all the examples you ve seen have used hard-coded values. That makes the examples simple, straightforward, and relatively secure. It also means they aren t that realistic, and they don t demonstrate one of the most serious risks for web applications that interact with a database SQL injection attacks. In simple terms, SQL injection is the process of passing SQL code into an application, in a way that was not intended or anticipated by the application developer. This may be possible because of the poor design of the application, and it affects only applications that use SQL string building techniques to create a command with user-supplied values. Consider the example shown in Figure 7-5. In this example, the user enters a customer ID, and the GridView shows all the rows for that customer. In a more realistic example the user would also need to supply some sort of authentication information such as a password. Or, the user ID might be based on a previous login screen, and the text box would allow the user to supply additional criteria such as a date range or the name of a product in the order.

Authorization is the process of determining the rights and restrictions assigned to an authenticated user In the conference analogy, authorization is the process of being granted permission to a particular type of session, such as the keynote speech At most conferences it is possible to purchase different types of access, such as full access, preconference only, or exhibition hall only This means if you want to attend the keynote address at Microsoft s Professional Developer Conference to hear what Bill Gates has to say, you must have the proper permissions (the correct conference pass) As you enter the keynote presentation hall, a member of staff will look at your conference badge Based on the information on the badge, the staff member will let you pass or will tell you that you cannot enter This is an example of authorization.

Summary

The problem is how this command is executed. In this example, the SQL statement is built dynamically using a string building technique. The value from the txtID text box is simply pasted into the middle of the string. Here s the code: Dim connectionString As String = WebConfigurationManager.ConnectionStrings("Northwind").ConnectionString Dim con As New SqlConnection(connectionString) Dim sql As String = "SELECT Orders.CustomerID, Orders.OrderID, _ & COUNT(UnitPrice) AS Items, SUM(UnitPrice * Quantity) _ & AS Total FROM Orders " & "INNER JOIN [Order Details] " _ & "ON Orders.OrderID = [Order Details].OrderID " _ & "WHERE Orders.CustomerID = '" _ & txtID.Text & "' " & "GROUP BY Orders.OrderID, Orders.CustomerID" Dim cmd As New SqlCommand(sql, con)

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