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Resources |
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Finding
Correct Content Managemet System
This
list covers the full lifecycle of a content management system, from initially
creating the content, through to delivering it to end users...
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Workflow Managemet Systems
Workflow
management is a crucial component in organizing a variety of business processes
so that they benefit the business as a whole and increase profitability...
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Using the Power of Content Management Systems
With
page editors that resemble a word processor program, adding content with a CMS
interface is simple and fun. Most CMS software also allows you to change the
location of your content pages and links easily, while the back end processes
takes care of updating the links throughout your site...
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Content Management Systems (CMS): What They Are And Why We Love Them
In the
past, individuals who took interest in having and operating their own websites
were burdened with the task of learning HTML, DHTML, and other web-based
technologies such as JavaScript and CSS. The only alternative to this was,
unfortunately, to pocket the expenses and costs required to pay a web developer
to build and maintain it for them...
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Outsourcing
Post
your project for outsourcing and get bids from qualified programmers,
designers, interpreters, copywriters.
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Code Walkthroughs |
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Datagrid
Formatting the Data
We are
able to format the content of the datagrid cell by one of two simple methods,
dependant upon whether the column is a bound column or whether it is a template
column. In our example we shall format the column to have to digits after the
decimal point , followed by a...
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Datagrid
Highlight a Row With Click Through
It is
relatively easy to add alternating colours to the rows in your datagrid.
However, when we move the mouse over the rows we may want to highlight this
row, and possibly to add the option of a click through based on the row
selected...
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Add
a Delete Button to a Datagrid
To add
a delete button to a datagrid follows a similar process to adding an edit
button. In the datagrid header...
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Add
an Edit Button to a Datagrid
The
datagrid has a predefined editColumn for handling the editing of a datagrid.
Adding this simple column definition to a datagrid adds a powerful feature.
When a row is not in edit mode the column item shows the word...
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Making
a Datagrid Row Editable
Two of
the most popular methods of editing a datagrid in asp.net are to either select
the row and take the user off to a different presentation of the data, or to
change the formatting of the row presented in the database with appropriate
edit text boxes, checkboxes and...
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Adding
Tooltips to Datagrid Rows
Adding
tooltips to datagrid rows is easy, assuming that you have already created the
code for adding row highlighting. In this article I shall assume that you have
already read the article entitled Datagrid Highlight a Row With Click
Through...
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Binding
a Datagrid to an Access Database
This
list covers the full lifecycle of a content management system, from initially
creating the content, through to delivering it to end users...
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Adding
Data to a DropDownList
The aim
of this article is to answer the question 'How do I add items to a
DropDownList?' Initially as part of the declaration for the DropDownList we can
also define a number of items, much in the same way as in classic ASP...
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Getting
Current Date Time
In
classic ASP we had now() which would return the current date and time. For
asp.net this no longer exists. So what should we use...
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Test
if File Exists
Sometimes,
in order to reduce our chance of error, when working with the filesystem in
ASP.NET, we need to determine wether a file exists before performing an action
on it. The following short piece of code will enable us to test whether a file
exists...
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Using
Javascript with ASP.NET Form Elements
Adding
simple pieces of Javascript to an Asp.net page can be acheived by adding to the
attributes of the particular imagebutton or linkbutton. if its normal ASP.Net
Button then you can...
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Regular
Expressions
In the table below we list the characters used in .Net
regular expressions, together with their meaning, But first...
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Authentication
in Asp.net
Forms
authentication in ASP.Net is far more easier and safe than Asp 3. It is
possible to place a web.config file in any directory of a web site.Therefore,
we are able to make most of a web site public, whilst providing authentication
on, say, one directory...
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32.1 How to print out all the variables in the Session?
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For Each strKey In Session.Keys
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Response.Write(strKey + " : " +
Session(strKey).ToString() + "<br>")
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foreach (string strKey in
Session.Keys)
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Response.Write(strKey + " : " +
Session[strKey].ToString() + "<br>");
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32.2 Why isn't session state available?
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- First, check your web.config, machine.config and your page directive to make
sure you have enabled session state. Reference:
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- session state is not available just everywhere, anytime. It is available only
after the HttpApplication.AcquireRequestState event is called. For example, it
is NOT available in the Application_OnAuthenticateRequest handler inside
global.asax. For details, see:
Handling Public Events
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- Lastly, make sure System.Web.SessionState.SessionStateModule is included the
in your config files. A common case is that SharePoint application will remove
this module from their web.config files (for performance reason), and thus
session state isn't available.
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32.3 Can I share session state between ASP.NET and ASP pages?
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32.4 Can I share session state between web applications (i.e. "virtual
directories" or "applications" in IIS)?
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32.5 What is the difference between Session.Abandon() and Session.Clear()?
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The major difference is that if you call Session.Abandon(), Session_End will be
fired (for InProc mode), and in the next request, Session_Start will be fired.
Session.Clear( ) just clears the session data without killing it.
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32.6 The SessionID remains the same even after the Session times out or Session
abandons?
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The SessionID lasts as long as the browser session lasts even though the session
state expires after the indicated timeout period i.e the same session ID can
represent multiple sessions over time where the instance of the browser remain
the same.
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32.7 Why are my Session variables lost frequently when using InProc mode?
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32.8 Does session state have a locking mechanism that serialize the access to
state?
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Session state implements a reader/writer locking mechanism:
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A page (or frame) that has session state write access (e.g. <%@ Page
EnableSessionState="True" %>) will hold a writer lock on the session until
the request finishes.
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A page (or frame) that has session state read access (e.g. <%@ Page
EnableSessionState="ReadOnly" %>) will hold a reader lock on the session
until the request finishes.
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Reader lock will block a writer lock; Reader lock will NOT block reader lock;
Writer lock will block all reader and writer lock.
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That's why if two frames both have session state write access, one frame has to
wait for the other to finish first
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32.9 Response.Redirect and Server.Transfer is not working in Session_End?
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Session_End is fired internally by the server, based on an internal timer. And
thus there is no HttpRequest associted when that happens. That is why
Response.Redirect or Server.Transfer does not make sense and will not work.
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32.10 Is the session Timeout attribute a sliding timeout value?
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The session Timeout is a sliding expiration time, meaning whatever your page
access session state, the expiration time will be moved forward. Note that as
long as a page has NOT disabled session state, it will access the session
automatically when requested.
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32.11 I am writing my own HttpHandler. Why is session state not working?
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Your HttpHandler has to implement the "marker" interface IRequiresSessionState
or IReadOnlySessionState in order to use session state.
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32.12 Why isn't Session available in my event handlers in global.asax?
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It depends on which event you're handling. Session is available only after
AcquireRequestState event
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32.13 When I use the Session in component class as Session("CustID"), I get
error message "Session is not declared". Why?
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Use HttpContext.Current.Session i.e
VB.NET
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HttpContext.Current.Session("CustID")
= "1"
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HttpContext.Current.Session["CustID"]
= "1";
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32.14 When I create a Session variable if I'm using inproc, where is the
session variable stored?
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In II5, it's stored in the memory of aspnet_wp.exe.
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For IIS6, by default all apps will share the same application pool, i.e. the
session state is stored in the memory of the process w3wp.exe. They are NOT
separated per application, but instead per application pool (w3wp.exe)
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32.15 Is the session timeout attribute in minutes or seconds?
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The Timeout setting is in minutes, not in seconds. i.e The timeout attribute
specifies the number of minutes a session can be idle before it is abandoned.
The default is 20
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32.16 Will my session state be saved when my page hit an error? Will my session
state be saved when my page hit an error? In Session_End, I tried to do some
cleanup job using SQL but it failed. Why?
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Session_End is supported only in InProc mode.
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Session_End is run using the account which runs the worker process
(aspnet_wp.exe), which can be specified in machine.config. Therefore, in your
Session_End, if you connect to SQL using integrated security, it will use that
worker process account credential to connect, and may fail depending on your
SQL security settings.
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32.17 Why do I lose my Session variables on redirect when I set "cookieless" to
true?
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When using cookieless, you must use relative path (e.g. ..\webform1.aspx)
instead of absolute path (e.g. \dir1\subdir1\webform1.aspx). If you use
absolute path, ASP.NET cannot preserve your session ID in the URL.
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32.18 How to store SortedList in Session or Cache?
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Dim x As New SortedList()
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Session("SortedList1") = x
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Dim y As SortedList =
CType(Session("SortedList1"), SortedList)
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SortedList x = new SortedList();
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Session["SortedList1"] = x;
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SortedList y = (SortedList)
Session["SortedList1"];
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32.19 Why do I get the error message "Session state can only be used when
enableSessionState is set to true, either in a configuration file or in the
Page directive"?
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This problem may occur after you install Windows Sharepoint Server(WSS) on a
server that has Microsoft Visual Studio .NET 2003 installed. The WSS ISAPI
filter handles all incoming URLs. When you browse one of the ASP.NET Web
application virtual directories, the ISAPI filter does not locate the URL path
of the folder.
To resolve this refer
Session state cannot be used in ASP.NET with Windows SharePoint Services
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32.20 How to remove a Session variable?
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Use HttpSessionState.Remove()
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32.21 Is there any way to know how much memory is being used by session
variables in my application?
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32.22 I have a frameset page which has an HTM extension, and I found out that
each frame it contains displays a different session id on the first request.
Why?
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The reason is that your frameset page is an HTM file instead of an ASPX file.
In normal a scenario, if the frameset is an aspx file, when you request the
page, it will first send the request to the web server, receive an asp.net
session cookie (which holds the session id), and then the browser will send
individual requests for the frames, and each request will carry the same
session id.
However, since your frameset page is an htm file, the first request comes back
without any session cookie because the page was serviced by ASP and not
ASP.NET. Then again your browser sends out individual requests for each frame.
But this time each individual request will NOT carry any session id, and so
each individual frame will create its own new session. That's why you will see
different session ids in each frame. The last request that comes back will win
by overwriting the cookie written by the previous two requests. If you do a
refresh, you will see them having the same session id.
This behavior is by-design, and the simple solution is to change your frameset
page to .aspx.
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32.23 Can different apps store their session state in different databases on
the same SQL server?
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32.24 Do I have a valid HttpSessionState object and HttpContext object in
Session_End?
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You will have the HttpSessionState object available. Just use 'Session' to
access it.
For HttpContext, it is not available because this event is not associated with
any request.
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32.25 Why aren't my sessions expiring, I am using SQLServer mode?
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In SQLServer mode, session expiration is carried out by the SQL Agent using a
registered job. Make sure your SQL Agent is running.
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32.26 I set EnableSessionState to "ReadOnly", but in InProc mode I can still
modify the session. Why is that?
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Even those enableSessionState is marked as ReadOnly, but in InProc state, the
user can still modify the session. The only difference is that the session will
not be locked during the request. This limitation is by-design
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32.27 How can I avoid specifying a plain password for my sql connection?
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Include a sql trusted connection, or put the connection string as encrypted data
in the registry. Refer
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32.28 How can I use Session variables in a class?
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