ASP.Net is the technology platform that is part and parcel of the
Microsoft .Net framework which is designed to help build web
applications. Whether the web applications are needed to be
internet Internet oriented, or designed to provide information
within the organization, the new ASP.Net technology is designed to
deliver powerful sophisticated web forms and services to a browser
independent
community. Early binding,
managed code, and viewstate techniques make for a much faster
and capable information delivery and transfer between the client
and server without the need for session variables and
cookies.
ASP.Net is managed using a system of XML configuration files that
hold information about how ASP is implemented on a machine level,
.Net level, and on an application basis. The file machine.config is
in the winnt\Microsoft.Net\Framework\version\Config directory, and
contains default information regarding the setup of asp.net ASP.Net
on that machine. For applications, web.config resides in the
project application's directory and inherits properties from the
machine.config file. However, it can override those settings, and
is
used to define session states,
security, and the like. Secondary web.config files can be in any
subdirectory belonging to the project application, inherits
properties from the two preceding files, and can be used to
override some of those properties with respect to the files in
its own subdirectory. You can use any standard text editor or
XML parser to create and edit ASP.NET ASP.Net configuration
files.
At runtime, the .Net application finds the config files, and uses
that information to determine how to implement the application. As
changes to those config files are detected during the running of
the application, changes in the implementation are made
accordingly.
The essence of ASP.Net is that it allows the creation of dynamic
web pages using information from the server to write the HTML
delivered to the client. This is distinct from dynamic HTML (DHTML)
where the client (desktop) writes the HTML output before it is
rendered by the browser. ASP pages use database output from the
server, or controls from the server to create the webpage before it
is delivered to the desktop, or the page is partially formed, and
output from the server is inserted into the code before it is
delivered to the browser.
ASP.Net also has an elaborate security system of its own which
integrates with Windows Security, and IIS Security to prevent
unauthorized access to data or files on the server.
The Page Object
The Page object Object is the primary
vehicle for expressing and
requesting information from the server. Request, Response, Server,
Application, and Session objects are now part of the page object
under ASP.Net. Of these, the Request, and Response classes are the
most important.
The Request class is used to request information from the server.
Its properties and methods are listed below.
Public Properties
AcceptTypes Gets a string array of client-supported MIME accept
types.
ApplicationPath Gets the ASP.NET application's virtual application
root path on the server.
Browser Gets information about the requesting client's browser
capabilities.
ClientCertificate Gets the current request's client security
certificate.
ContentEncoding Gets or sets the character set of the
entity-body.
ContentLength Specifies the length, in bytes, of content sent by
the client.
ContentType Gets or sets the MIME content type of the incoming
request.
Cookies Gets a collection of cookies sent by the client.
CurrentExecutionFilePath Gets the virtual path of the current
request.
FilePath Gets the virtual path of the current request.
Files Gets the collection of client-uploaded files (Multipart MIME
format).
Filter Gets or sets the filter to use when reading the current
input stream.
Form Gets a collection of form variables.
Headers Gets a collection of HTTP headers.
HttpMethod Gets the HTTP data transfer method (such as GET, POST,
or HEAD) used by the client.
InputStream Gets the contents of the incoming HTTP entity
body.
IsAuthenticated Gets a value indicating whether the user has been
authenticated.
IsSecureConnection Gets a value indicting whether the HTTP
connection uses secure sockets (that is, HTTPS).
Gets the specified object in the Cookies, Form, QueryString or
ServerVariables collections.
In C#, this property is the indexer for the HttpRequest
class.
Params Gets a combined collection of QueryString, Form,
ServerVariables, and Cookies items.
Path Gets the virtual path of the current request.
PathInfo Gets additional path information for a resource with a
URL extension.
PhysicalApplicationPath Gets the physical file system path of the
currently executing server application's root directory.
PhysicalPath Gets the physical file system path corresponding to
the requested URL.
QueryString Gets the collection of HTTP query string
variables.
RawUrl Gets the raw URL of the current request.
RequestType Gets or sets the HTTP data transfer method (GET or
POST) used by the client.
ServerVariables Gets a collection of Web server variables.
TotalBytes Gets the number of bytes in the current input
stream.
Url Gets Information about the URL of the current request.
UrlReferrer Gets information about the URL of the client's
previous request that linked to the current URL.
UserAgent Gets the raw user agent string of the client
browser.
UserHostAddress Gets the IP host address of the remote
client.
UserHostName Gets the DNS name of the remote client.
UserLanguages Gets a sorted string array of client language
preferences.
Public Methods
BinaryRead Performs a binary read of a specified number of bytes
from the current input stream.
Equals (inherited from Object) Overloaded. Determines whether two
Object instances are equal.
GetHashCode (inherited from Object) Serves as a hash function for
a particular type, suitable for use in hashing algorithms and data
structures like a hash table.
GetType (inherited from Object) Gets the type of the current
instance.
MapImageCoordinates Maps an incoming image-field form parameter to
appropriate x/y coordinate values.
MapPath Overloaded. Maps the virtual path in the requested URL to
a physical path on the server for the current request.
SaveAs Saves an HTTP request to disk.
ToString (inherited from Object) Returns a String that represents
the current Object.
ValidateInput Validates data submitted by a client browser and
raises an exception if potentially dangerous data is present.
Laptop Battery The Response class is used to write to the browser. We
reproduced its properties and methods below.
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Thinkpad Buffer Gets or sets a value indicating whether to buffer output
and send it after the entire response is finished processing.
BufferOutput Gets or sets a value indicating whether to buffer
output and send it after the entire page is finished
processing.
Cache Gets the caching policy (expiration time, privacy, vary
clauses) of a Web page.
CacheControl Sets the Cache-Control HTTP header to Public or
Private.
Charset Gets or sets the HTTP character set of the output
stream.
ContentEncoding Gets or sets the HTTP character set of the output
stream.
ContentType Gets or sets the HTTP MIME type of the output
stream.
Cookies Gets the response cookie collection.
Expires Gets or sets the number of minutes before a page cached on
a browser expires. If the user returns to the same page before it
expires, the cached version is displayed. Expires is provided for
compatiblility with previous versions of ASP.
ExpiresAbsolute Gets or sets the absolute date and time at which
to remove cached information from the cache.
ExpiresAbsolute is provided for compatibility with previous
versions of ASP.
Filter Gets or sets a wrapping filter object used to modify the
HTTP entity body before transmission.
IsClientConnected Gets a value indicating whether the client is
still connected to the server.
Output Enables output of text to the outgoing HTTP response
stream.
OutputStream Enables binary output to the outgoing HTTP content
body.
RedirectLocation Gets or sets the value of the Http Location
header.
Status Sets the Status line that
is returned to the client.
StatusCode Gets or sets the HTTP status code of the output
returned to the client.
StatusDescription Gets or sets the HTTP status string of the
output returned to the client.
SuppressContent Gets or sets a value indicating whether to send
HTTP content to the client.
Public Methods
AddCacheItemDependencies Makes the validity of a cached item
dependent on other items in the cache.
AddCacheItemDependency Makes the validity of a cached item
dependent on another item in the cache.
AddFileDependencies Adds a group of file names to the collection
of file names on which the current response is dependent.
AddFileDependency Adds a single file name to the collection of
file names on which the current response is dependent.
AddHeader Adds an HTTP header to the output stream.
AddHeader is provided for compatibility with previous versions of
ASP.
AppendHeader Adds an HTTP header to the output stream.
AppendToLog Adds custom log information to the IIS log file.
ApplyAppPathModifier Adds a session ID to the virtual path if the
session is using cookieless session state and returns the combined
path. If cookieless session state is not used, ApplyAppPathModifier
returns the original virtual path.
BinaryWrite Writes a string of binary characters to the HTTP
output stream.
Clear Clears all content output from the buffer stream.
ClearContent Clears all content output from the buffer
stream.
ClearHeaders Clears all headers from the buffer stream.
Close Closes the socket connection to a client.
End Sends all currently buffered output to the client, stops
execution of the page, and raises the Application_EndRequest
event.
Equals (inherited from Object) Overloaded. Determines whether two
Object instances are equal.
Flush Sends all currently buffered output to the client.
GetHashCode (inherited from Object) Serves as a hash function for
a particular type, suitable for use in hashing algorithms and data
structures like a hash table.
GetType (inherited from Object) Gets the type of the current
instance.
Pics Appends a PICS-Label HTTP header to the output stream.
Redirect Overloaded. Redirects a client to a new URL.
RemoveOutputCacheItem Static method removes from the cache all
cached items associated with the specified path.
ToString (inherited from Object) Returns a String that represents
the current Object.
Write Overloaded. Writes information to an HTTP output content
stream.
WriteFile Overloaded. Writes the specified file directly to an
HTTP content output stream.
Resources
Tutorial List on
ASP.Net
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ASP.Net.
. Useful Information on ASP.Net
This is an excellent resource on ASP.Net.
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