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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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17.1 How can I remove the cache of a page (cached with VaryByParam) for certain
request params in code?
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You can attach a cache dependency to the response that is unique per query
param, then invalidate the dependency for that particular param:
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// add cache item dependency on
response
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string cacheKey = "xxx.aspx?" +
queryParam;
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Cache[cacheKey] = new object();
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Response.AddCacheItemDependency(cacheKey);
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// invalidate the dependency
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string cacheKey = "xxx.aspx?" +
queryParam;
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17.2 How can I set a page/control to be cached only for certain parameters?
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Let's say you set your output cache directive as follows:
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<%@ OutputCache Duration="86400"
VaryByParam="RegionID" VaryByCustom="ProductID" %>
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VaryByCustom - is a string that your application has to interpret in the
GetVaryByCustomString override in the gloabal.asax file.
Now, to avoid caching pages for certain ProductIDs you can set the cacheability
to private or nocache from your page load for those pages as follows:
VB.NET
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Response.Cache.SetCacheability(HttpCacheability.Private)
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Response.Cache.SetCacheability(HttpCacheability.Private)
;
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17.3 What is Output Caching?
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Output caching lets you cache the output of static aspx pages or portions of
pages to improve performance. Since the pages are cached asp.net doesn't have
to regenerate the html for every request.
For more information see:
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17.4 I want to Cache based on HTTP header .How can I do that?
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<%@OutputCache ...
VaryByHeader="UserAgent" %>
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<%@ OutputCache ...
VaryByHeader="Accept-Language" %>
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17.5 How to make a page expire immediately in such a way that a warning message
"This page has expired."appears?
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<%@ OutputCache location="none"
%>
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17.6 How to prevent client Cache? I want every client request get sent to the
server even if it's behind a proxy server and for any browser setting.
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<%@ OutputCache Duration="0"
Location="None" VaryByParam="none" %>
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Response.Cache.SetCacheability(HttpCacheability.NoCache)
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Response.Cache.SetCacheability(HttpCacheability.NoCache);
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17.7 Is there any way to cache by browser a page or User Control?
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Try VaryByCustom="browser" in the user control/page.
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17.8 Is caching PDF Files a good or bad idea?
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If the PDF files are on the disk, you should just let the IIS handle them. The
IIS static file handler performs caching and is much faster than the ASP.NET
cache.
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17.9 How to remove Output Cache by param?
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You can attach a cache dependency to the response that is unique per query
param, then invalidate the dependency for the particular param:
VB.NET
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'add cache item dependency on
response
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Dim cacheKey As String =
"webform1.aspx?" + queryParam
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Cache(cacheKey) = New Object() '
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Response.AddCacheItemDependency(cacheKey)
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' invalidate the dependency
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Dim cacheKey As String =
"webform1.aspx?" + queryParam
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// add cache item dependency on
response
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string cacheKey = "webform1.aspx?" +
queryParam;
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Cache[cacheKey] = new object();
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Response.AddCacheItemDependency(cacheKey);
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// invalidate the dependency
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string cacheKey = "webform1.aspx?" +
queryParam;
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17.10 How can I programatically invalidate the outputcache from a usercontrol?
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You could add a dependency to the output cached control, and change the
dependency to evict the control. Here's code to do that:
VB.NET
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If TypeOf Parent Is
System.Web.UI.BasePartialCachingControl Then
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Cache("dependent")
= "dependent"
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Dim
dep As New CacheDependency(Nothing, New String() {"dependent"}) '
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CType(Parent,
System.Web.UI.BasePartialCachingControl).Dependency = dep
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if (Parent is
System.Web.UI.BasePartialCachingControl)
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Cache["dependent"]
= "dependent";
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CacheDependency
dep = new CacheDependency(null, new string[] "dependent");
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((System.Web.UI.BasePartialCachingControl)Parent).Dependency
= dep;
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17.11 Is it possible to cache a page by Browser Version and/or some params?
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<%@ OutputCache Duration="60"
VaryByParams="abc;xyz" VaryByCustom="browsermajorversion" %>
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In your global.asax file:
VB.NET
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Public Overrides Function
GetVaryByCustomString(context As HttpContext, custom As String) As String
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If
custom.ToLower() = "browsermajorversion" Then
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Dim
browser As HttpBrowserCapabilities = context.Request.Browser
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Return
browser.Browser + " " + browser.MajorVersion
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Return
MyBase.GetVaryByCustomString(context, custom)
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End Function 'GetVaryByCustomString
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public override string
GetVaryByCustomString(HttpContext context, string custom)
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if
(custom.ToLower() == "browsermajorversion") {
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HttpBrowserCapabilities
browser = context.Request.Browser;
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return
browser.Browser + " " + browser.MajorVersion;
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return
base.GetVaryByCustomString(context, custom);
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17.12 Why do I get the error message "The type or namespace name
'CacheDependency' could not be found (are you missing a using directive or an
assembly reference?) "?
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Use namespace System.Web.Caching or
refer to it as System.Web.Caching.CacheDependency
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17.13 Is there a way that I can clear/expire a page cache from another
page/class?
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No, not easily unless you use the output cache APIs on Response.Cache and take
advantage of the Response.AddCacheDependency() to make the page dependent on a
common key.
Then, from the other page or class you could invalidate the common key which
would enforce a dependency eviction (since the key page1 depended on changed).
Refer
How to remove OutputCache by param?
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17.14 How to access the Cache from a compiled class?
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somevar=System.Web.HttpContext.Current.Cache("
")
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somevar=System.Web.HttpContext.Current.Cache("
");
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17.15 How can I cache the page by the complete querystring?
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<%@ OutputCache Duration="10"
VaryByParam="*" %>
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This should result in any changes to querystring parameters causing a new
version of the page to be cached. Keep in mind that this can significantly
increase the amount of memory used for caching, depending on how many
querystring parameters you're using.
Note: "*" is not recommended - it is best to use a list of params that your
page truly varies by.
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17.16 How do I access the cache in the Global.asax?
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17.17 How to display items stored in a local application Cache?
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Dim objItem As DictionaryEntry
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For Each objItem In Cache
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Response.Write(("Key
:" + objItem.Key.ToString() + "
"))
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Response.Write(("
Value :" + objItem.Value.ToString() + "
"))
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foreach(DictionaryEntry objItem in
Cache)
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Response.Write
("Key :" + objItem.Key.ToString () + "
");
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Response.Write("
Value :" + objItem.Value.ToString ()+ "
" ) ;
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17.18 Is there a Cache.RemoveAll()? How can I clear / remove the total cache?
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