visual basic barcode Common Security Scenarios in .NET

Get Code-128 in .NET Common Security Scenarios

ds = New DataSet() da.Fill(ds, "Article") GetArticleList = ds Catch e As Exception Finally cn.Close() End Try End Function In this example, the GetArticleList method returns a DataSet object rather than a DataReader object or any of the other objects that can contain multiple records. Why a DataSet When data moves across a machine or process boundary, it s said to be marshaled. The data must somehow be converted from the internal type to a format that can be sent across a wire. In the case of XML Web services, the wire format is XML, and so the object must in some way be convertible to text. The GetArticleList method returns a DataSet object, because DataSet can be marshaled by ASP.NET. All of the other alternatives (such as SqlDataReader) can t be marshaled by an XML Web service. All the standard types, such as int and double, Enum types, classes and structs, XmlNode objects, and DataSet objects can be marshaled by ASP.NET. Arrays of the supported types can also be marshaled. Although not every object can be marshaled by an XML Web service, the types that can be marshaled are much richer than those available to DCOM objects, without using custom marshaling.

TABLE 23-3

A method representing the property s get accessor method . This is emitted only if you define a get accessor method for the property . A method representing the property s set accessor method . This is emitted only if you define a set accessor method for the property . A property definition in the managed assembly s metadata . This is always emitted .

In this exercise, you create the web application project. You also add a site map XML file and configure the layout of the navigation controls on the Default.aspx page.

Programmers are well aware that many arithmetic operations on primitives could result in an overflow:

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Figure 27-2 As project size increases, errors usually come more from requirements and design. Sometimes they still come primarily from construction. Sources: Software Engineering Economics (Boehm 1981), Measuring and Managing Software Maintenance (Grady 1987), and Estimating Software Costs (Jones 1998).

Click Next to begin doing the optional tasks you skipped previously. When you re all nished, and you get to the end of the tasks list again, click Next and then select Finish The Migration if you have any skipped tasks that you don t want to do.

the operation the CancellationToken returned from calling CancellationToken s static None property . This property returns a special CancellationToken instance that is not associated with any CancellationTokenSource object (its private field is null) . Since there is no CancellationTokenSource, no code can call Cancel, and the operation that is querying the special CancellationToken s IsCancellationRequested property will always get back false . If you query CancellationToken s CanBeCanceled property using one of these special CancellationToken instances, the property will return false . The property returns true for all other CancellationToken instances obtained by querying a CancellationTokenSource object s Token property .

<asp:SqlDataSource ID="SqlDataSourceUpdate" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionStringNorthwind %>" DeleteCommand="DELETE FROM [Customers] WHERE [CustomerID] = @CustomerID" InsertCommand="INSERT INTO [Customers] ([CustomerID], [CompanyName], [ContactName], [ContactTitle], [Address], [City], [Region], [PostalCode], [Country], [Phone], [Fax]) VALUES (@CustomerID, @CompanyName, @ContactName, @ContactTitle, @Address, @City, @Region, @PostalCode, @Country, @Phone, @Fax)" SelectCommand="SELECT [CustomerID], [CompanyName], [ContactName], [ContactTitle], [Address], [City], [Region], [PostalCode], [Country], [Phone], [Fax] FROM [Customers] WHERE ([CustomerID] = @CustomerID)" UpdateCommand="UPDATE [Customers] SET [CompanyName] = @CompanyName, [ContactName] = @ContactName, [ContactTitle] = @ContactTitle, [Address] = @Address, [City] = @City, [Region] = @Region, [PostalCode] = @PostalCode, [Country] = @Country, [Phone] = @Phone, [Fax] = @Fax WHERE [CustomerID] = @CustomerID"> <DeleteParameters> <asp:Parameter Name="CustomerID" Type="String" /> </DeleteParameters> <InsertParameters> <asp:Parameter Name="CustomerID" Type="String" /> <asp:Parameter Name="CompanyName" Type="String" /> <asp:Parameter Name="ContactName" Type="String" /> <asp:Parameter Name="ContactTitle" Type="String" /> <asp:Parameter Name="Address" Type="String" /> <asp:Parameter Name="City" Type="String" /> <asp:Parameter Name="Region" Type="String" /> <asp:Parameter Name="PostalCode" Type="String" /> <asp:Parameter Name="Country" Type="String" /> <asp:Parameter Name="Phone" Type="String" /> <asp:Parameter Name="Fax" Type="String" /> </InsertParameters> <SelectParameters> <asp:ControlParameter ControlID="GridView1" Name="CustomerID" PropertyName="SelectedValue" Type="String" /> </SelectParameters> <UpdateParameters> <asp:Parameter Name="CompanyName" Type="String" /> <asp:Parameter Name="ContactName" Type="String" /> <asp:Parameter Name="ContactTitle" Type="String" /> <asp:Parameter Name="Address" Type="String" /> <asp:Parameter Name="City" Type="String" /> <asp:Parameter Name="Region" Type="String" /> <asp:Parameter Name="PostalCode" Type="String" /> <asp:Parameter Name="Country" Type="String" /> <asp:Parameter Name="Phone" Type="String" /> <asp:Parameter Name="Fax" Type="String" /> <asp:Parameter Name="CustomerID" Type="String" /> </UpdateParameters> </asp:SqlDataSource>

You are creating an ASP.NET webpage that displays a list of customers generated by a database query. The user can filter the list so that only customers within a specific state are displayed. You want to maximize the performance of your web application by using page output caching. You want to ensure that users can filter by state, but you are not concerned about displaying updates to the list of customers because the customer list doesn t change very frequently. Which declarative @ OutputCache attribute should you configure