Web developer follows the approach described in the article, when he/she has to restrict access to the pages of his/her application to authorized users only. In this case Web developer should change the web.config settings of his/her application to specify Forms authentication, and then create an .aspx login page to collect user credentials and complete the authentication check.
Web …
Let start with a classical example – Web developer works under application which has a Web page with two drop-down lists. The first one contains all the cities in the country, and the second one contains the bank branches locations in the selected city. Web developer needs to populate the second drop-down list with the correct locations each …
Suppose that the user has to read the XML file he/she already generated. The application should provide functionality to extract all vendors from Canada, and after that the user has to process them in alphabetic order.
Web developer has to follow these steps:
1.Create the XDocument using the XML.
2.Navigate the XElement elements to reach the Vendor ones.
3.Take the XElement instances …
Let’s Web developer has to develop a page where the user submits a file containing the ISBN of all the books he/she needs information about. The user has to retrieve these books and create an XML file with the book title, author and price.
Web developer can use a LINQ query to pass child elements and nest data, by …
In .NET Framework 4.0 the System.Xml APIs are obsolete and are maintained for compatibility reasons only. Web developers can create XML file by using LINQ to XML. The next picture presents classes in LINQ to XML.
The classes in LINQ to XML
These classes are included in System.Xml.Linq namespace and the following ones are the most …
Software developer can interact with session state using the System.Web.SessionState.HttpSessionState class, which is provided in an ASP.NET web page as the built-in Session object. Items can be added to the collection and retrieved after in the same manner as items can be added to a page’s view state:
For example, software developer might store a string in memory like …
How to transfer information between pages in ASP.NET using a query string in C#
Software developer can use this approach for information that don’t need to be hidden or made tamper-prof. Unlike view state information passed through the query string is clearly visible and unencrypted. The query string is the portion of the URL after the question mark in the following example:
https://www.google.com?q=look+for+aspnet+code
Software developer can store information in the query string himself using …
How to transfer information between pages in ASP.NET using cross-page posting in C#
Software developer can transfer information between pages with technique named cross-page posting. If he wants to do use it he has to define specific, limited methods that extract just the information he need it. Let’s for example he have a page with text boxes as controls for credit card. In this case software developer might decide to add …
Software developer can store custom objects in a view state just as easily as regular types. However, to store an item in a view state, ASP.NET must be able to convert it into a stream of bytes. This process is called serialization. If developer’s objects aren’t serializable, he will receive an error message when he attempts to place …
You can put the focus on the following types of ASP.NET controls: Button, LinkButton, and ImageButton controls, CheckBox control, DropDownList control, FileUpload control, HyperLink control, ListBox control, RadioButton control, TextBox control.
The following C# code example shows how to set the focus on the control with the ID TextBox1:
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Focus();
}
Related TutorialsHow to change the text …