Asp.Net Questions

Define SMTPclient class in DotNet framework class libarary?

Each classes in dotnet framework inclue some properties,method and events.These properties ,methods and events are member of a class.SMTPclient class mainly concern with sending mail.This class contain the folling member.
Properties:-
Host:-The name or IP address of email server.
Port:-Port that is use when sending mail.
Methods:-
Send:-Enables us to send email synchronously.
SendAsynchronous:-Enables us to send an email asynchronously.
Event:-
SendCompleted:-This event raised when an asynchronous send opertion completes.

What do you mean by three-tier architecture?

The three-tier architecture was comes into existence to improve management of code and contents and to improve the performance of the web based applications.There are mainly three layers in three-tier architecture.the are define as follows
(1)Presentation
(2)Business Logic
(3)Database
(1)First layer Presentation contains mainly the interface code, and this is shown to user. This code could contain any technology that can be used on the client side like HTML, JavaScript or VBScript etc.
(2)Second layer is Business Logic which contains all the code of the server-side .This layer have code to interact with database database and to query, manipulate, pass data to user interface and handle any input from the UI as well.
(3)Third layer Data represents the data store like MS Access, SQL Server, an XML file, an Excel file or even a text file containing data also some addtional database are also added to that layers.

How Visual SourceSafe helps Us ?

One of the powerful tool provided by Microsoft to keep up-to-date of files system its keeps records of file history once we add files to source safe it can be add to database and the changes ade by diffrenet user to this files are maintained in database from that we can get the older version of files to.This also helps in sharing,merging of files.

How to start Outlook,NotePad file in AsP.NET with code ?

Here is the syntax to open outlook or notepad file in ASP.NET VB.NET Process.Start("Notepad.exe") Process.Start("msimn.exe"); C#.NET System.Diagnostics.Process.Start("msimn.exe"); System.Diagnostics.Process.Start("Notepad.exe");

What is cross page posting in ASP.NET2.0 ?

When we have to post data from one page to another in application we used server.transfer method but in this the URL remains the same but in cross page posting there is little different there is normal post back is done but in target page we can access values of server control in the source page.This is quite simple we have to only set the PostBackUrl property of Button,LinkButton or imagebutton which specifies the target page.In target page we can access the PreviousPage property.And we have to use the @PreviousPageType directive.We can access control of PreviousPage by using the findcontrol method.When we set the PostBackURL property ASP.NET framework bind the HTML and Javascript function automatically.

Describe the Provider Model and Personalization in ASP.NET 2.0?

The Provider model in ASP.NET 2.0 is based on the Provider Design Pattern that was created in the year 2002 and later implemented in the .NET Framework 2.0.

The Provider Model supports automatic creation of users and their respective roles by creating entries of them directly in the SQL Server (May even use MS Access and other custom data sources). So actually, this model also supports automatically creating the user table's schema.

The Provider model has 2 security providers in it: Membership provider and Role Provider. The membership provider saves inside it the user name (id) and corresponding passwords, whereas the Role provider stores the Roles of the users.

For SQL Server, the SqlMembershipProvider is used, while for MS Access, the AccessMembershipProvider is used. The Security settings may be set using the website adminstration tool. Automatically, the AccessMembershipProvider creates a Microsoft Access database file named aspnetdb.mdb inside the application's App_Data folder. This contains 10 tables.

ASP.NET 2.0 Personalization - Personalization allows information about visitors to be persisted on a data store so that the information can be useful to the visitor when they visit the site again. In ASP.NET 2.0, this is controlled by a Personalization API. Before the Personalization Model came into existence, the prior versions of ASP.NET used of the old Session object to take care of re-visits. Now comes the Profile object.

In order to use a Profile object, some settings need to be done in web.config. The example below shall explain how to use a profile object:

//Add this to System.Web in web.config








'In Page_Load event, add the following...

If Profile.FirstName <> "" Then
Panel1.Visible = False
Response.Write("Welcome Back Dear :, " & Profile.FirstName & ", " & Profile.LastName)
Else
Panel1.Visible = True
End If

'Here is the code how to save the profile properties in an event to save it
Profile.FirstName = txtFirstName.Text
Profile.LastName = txtLastName.Text

What is IIS Metabase? How to edit IIS metabase? How to backup IIS metabase file?

IIS Metabase - sounds like geek stuff right! What is IIS Metabase??? In the simplest words, IIS metabase is the repository of the configuration values that are set in the Internet Information Server (IIS). The IIS metabase in an XML file. It may be controlled through program or manually too.

In order to edit IIS metabase entries, the user needs to have administrative rights on the system. To do this, in run window, type "inetmgr". Browse to "Local Computer" and right click it. Click on "Properties". Select the "Enable Direct Metabase Edit" check box.

Many times, due to the existence of multiple versions of .NET framework, some settings in the IIS metabase may get affected and cause your program not to run. For such scenarios, you may take a backup of the IIS metabase XML file and recover it. To create a portable backup, open run window and type "inetmgr". Next browse to "Local Computer" and go to "All Tasks". Next, click on Backup/Restore Configuration. Next, click on "Create Backup". In the textbod box for Configuration Backup name, type a name for your backup file. Also select the encrypt backup option and type a password. To finish the process, click "OK".

Search for Metabase.xml file on your IIS Web Server.

What is Authentication? What are the different types of Authentication?

In a client-server environment, there are plenty of cases where the server has to interact and identify the client that sends a request to the server. Authentication is the process of determining and confirming the identity of the client.

If a client is not successfully identified, it is said to be anonymous.

Types of Authentication
Windows Authentication
Forms Authentication
Passport Authentication

Essentially the Windows Authentication and Forms Authentication are the famous ones, as Passport Authentication is related to a few websites (like microsoft.com, hotmail.com, msn.com etc. only).

Windows Authentication is implemented mostly in Intranet scenarios. When a browser (client) sends a Request to a server where in windows authentication has been implemented, the initial request is anonymous in nature. The server sends back a Response with a message in HTTP Header. This Prompts a Window to display a Modal Dialog Box on the browser, where the end user may enter the "User name" and "Password".

The end user enters the credentials, which are then validated against the User Store on the Windows server. Note that each user who access the Web Application in a Windows Authentication environment needs to have a Windows Account in the company network.

How to avoid or disable the modal dialog box in a Windows Authentication environment?
By enabling the Windows Integrated Authentication checkbox for the web application through settings in IIS.

Forms Authentication is used in Internet based scenarios, where its not practical to provide a Windows based account to each and every user to the Web Server. In a Forms Authentication environment, the user enters credentials, usually a User Name and a corresponding Password, which is validated against a User Information Store, ideally a database table.

Forms Authentication Ticket is the cookie stored on the user's computer, when a user is authenticated. This helps in automatically logging in a user when he/she re-visits the website. When a Forms Authentication ticket is created, when a user re-visits a website, the Forms Authentication Ticket information is sent to the Web Server along with the HTTP Request.