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' Define ADO.NET objects. Dim insertSQL As String insertSQL = "INSERT INTO Authors (" insertSQL &= "au_id, au_fname, au_lname, " insertSQL &= "phone, address, city, state, zip, contract) " insertSQL &= "VALUES ('" insertSQL &= txtID.Text & "', '" insertSQL &= txtFirstName.Text & "', '" insertSQL &= txtLastName.Text & "', '" insertSQL &= txtPhone.Text & "', '" insertSQL &= txtAddress.Text & "', '" insertSQL &= txtCity.Text & "', '" insertSQL &= txtState.Text & "', '" insertSQL &= txtZip.Text & "', '" insertSQL &= Val(chkContract.Checked) & "')" Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand(insertSQL, con) ' Try to open the database and execute the update. Dim added As Integer = 0 Try con.Open() added = cmd.ExecuteNonQuery() lblResults.Text = added.ToString() & " records inserted." Catch err As Exception lblResults.Text = "Error inserting record. " lblResults.Text &= err.Message Finally con.Close() End Try ' If the insert succeeded, refresh the author list. If added > 0 Then FillAuthorList() End If End Sub If the insert fails, the problem will be reported to the user in a rather unfriendly way (see Figure 15-14). This is typically the result of not specifying valid values. If the insert operation is successful, the page is updated with the new author list.

The Hashtable collection (in the SystemCollections namespace) allows you to store any type of object and use any type of object for the key values The Dictionary collection (in the SystemCollectionsGeneric namespace) uses generics to provide the same locking in behavior as the List collection You choose the item type and the key type upfront to prevent errors and reduce the amount of casting code you need to write The following example uses the Dictionary collection class, which it creates once the first time the page is requested You create a Dictionary object in much the same way you create an ArrayList or List collection The only difference is that you need to supply a unique key for every item This example uses the lazy practice of assigning a sequential number for each key: protected void Page_Load(Object sender, EventArgs e) { if (!this.

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useful error messages. You should never display the detailed database error information shown in Figure 15-14, because it could give valuable information to malicious users.

IsPostBack) { // Use integers to index each item Each item is a string Dictionary<int, string> fruit = new Dictionary<int, string>(); fruitAdd(1, fruitAdd(2, fruitAdd(3, fruitAdd(4, fruitAdd(5, fruitAdd(6, fruitAdd(7, fruitAdd(8, "Kiwi"); "Pear"); "Mango"); "Blueberry"); "Apricot"); "Banana"); "Peach"); "Plum");.

Port: This combines a binding with an endpoint and provides the URL where the service can be located. The port is the actual fully qualified URL to the PHP script that will host your SOAP server. Service: This defines a collection of ports that make up your web service.

The previous example performed its database work using a dynamically pasted-together SQL string. This off-the-cuff approach is great for quickly coding database logic, and it s easy to understand. However, it has two potentially serious drawbacks: Users may accidentally enter characters that will affect your SQL statement. For example, if a value contains an apostrophe ('), the pasted-together SQL string will no longer be valid. Users might deliberately enter characters that will affect your SQL statement. Examples include using the single apostrophe to close a value prematurely and then following the value with additional SQL code. The second of these is known as SQL injection attack, and it facilitates an amazingly wide range of exploits. Crafty users can use SQL injection attacks to do anything from returning additional results (such as the orders placed by other customers) or even executing additional SQL statements (such as deleting every record in another table in the same database). In fact, SQL Server includes a special system stored procedure that allows users to execute arbitrary programs on the computer, so this vulnerability can be extremely serious.

// Define the binding for the list controls. MyListBox.DataSource = fruit; // Choose what you want to display in the list. MyListBox.DataTextField = "Value"; // Activate the binding. this.DataBind(); } } There s one new detail here. It s this line: MyListBox.DataTextField = "Value"; Each item in a dictionary-style collection has both a key and a value associated with it. If you don t specify which property you want to display, ASP.NET simply calls the ToString() method on each

collection item. This may or may not produce the result you want. However, by inserting this line of code, you control exactly what appears in the list. The page will now appear as expected, with all the fruit names.

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