Converting Single-File Web Forms Pages to Code-Behind Pages

Sometimes I face some problem with single web form(only aspx page no code behind page) page. I am used to work in code-behind page,so that I try to solve this problem in may way but at last I found the solution in msdn. So I want to share this portion of the article with you:

It might be that the only thing you want to do with a single-file Web Forms page in Visual Studio is to convert it to a code-behind Web Forms page. Using Visual Studio to convert a single-file page to a code-behind page automatically accomplishes the following:

1. Generates a code-behind class file for the page.
2. Adds the appropriate page directives to the page so it is linked with the code-behind file.

The conversion does not do the following:

a. Convert inline code to code in the class file.

To convert a single-file .aspx page to code-behind

1. Open an existing project, or create a new ASP.NET Web application.
2. On the Project menu, click Add Existing Item.
3. Browse to the .aspx page that you want to convert.
4. Click Open. Visual Studio will display the following message:

There is no class file in the project associated with the Web Form ''. Create a new class file now?
5. Click Yes. Visual Studio will create the code-behind file and link it to the .aspx page.
6. Click the Show All Files button in Solution Explorer, and expand the tree below your newly converted file to see the code-behind class file.
7. Open the new .aspx file.
8. In HTML view, inspect the file to make sure it contains an @ Page directive at the top that contains the CodeBehind attribute.
9. Inspect the file to make sure it contains an HTML

element within the HTML tags. If not, add <form> and </form> tags around your controls, and in the opening tag, set the runat = "server" attribute so it looks similar to the following:

<form id="Form1" method="post" runat="server">

10. If the file contains calls to COM components — for example, ADO code — add the AspCompat attribute to the Page directive in HTML view:

<%@ Page [...] AutoEventWireup="false" AspCompat="true" %>

If you do not have any calls to COM components, you do not need to add the AspCompat attribute.
11. Move your code out of the .aspx file and into the .aspx.vb or .aspx.cs file.
If you are working with a legacy file that contains ASP code, you must convert it to ASP.NET code before you can move it to the code-behind page. Converting to ASP.NET also will help you to take advantage of dynamic browser customization, state maintenance, and other features the ASP.NET server controls provide. For details, see Converting ASP to ASP.NET.
12. Save the form, compile the project, and view it in the browser.
13. Check for issues that appear in the Task List window, and resolve them.

For more info please visit:
http://msdn.microsoft.com/en-us/library/aa290385%28VS.71%29.aspx

Basic Idea on JSON

What is JSON?

JSON is a very lightweight data format based on a subset of the JavaScript syntax, namely array and object literals. JSON allows communicating with server in a standard way. JSON is used as communication notation instead of XML.

JSON objects are typed while XML data is typeless
1.JSON types: string, number, array, boolean,
2.XML data are all string

JSON stands for Javascript Object Notation which is a data structuring format that is extremely clean and lightweight. Even though JSON is native to javascript (as in, it can be turned into an object directly by javascript), it is quite easy to handle with other languages, making it an ideal replacement of XML when javascript is involved with the exchange of data (i.e. ajax).

var fruitColors =
{
"apple":"green",
"banana":"yellow",
"orange":"orange"
};

alert(fruitColors .apple); //outputs "green"
alert(fruitColors .orange); //outputs "orange"

The above code creates an javascript object bike with two properties apple and orange

JSON Structures
• A collection of name/value pairs
In various languages, this is realized as an object, record,struct, dictionary, hash table, keyed list, or associative array
• An ordered list of values
In most languages, this is realized as an array, vector, list, or sequence

JSON Object Notation
• A JSON object is an unordered set of name/value pairs
• A JSON object begins with { (left brace) and ends with } (right brace)
• Each name is followed by : (colon) and the name/value pairs are separated by , (comma)

For more info please visit:
http://msdn.microsoft.com/en-us/library/bb299886.aspx
http://www.json.org/
http://en.wikipedia.org/wiki/JSON

Problem using AJAX call in IE6 and IE7

IE6 & IE7 makes problem when use xmlhttprequest for ajax

At first time when I used core ajax using xmlhttprequest. Using this technique we sent parameter as querystring through the url,like this,

function GetEmailId()
{
var url="http://server.com/test.aspx";
url=url+"&sid=test";
xmlhttp.onreadystatechange=statechangedLogin;
xmlhttp.open("GET", url, true);
xmlhttp.send(null);
}
function statechangedLogin()
{
if(xmlhttp.readyState==4)
{
if(xmlhttp.responseText=="Login")
{
//write your code
}
}
}

For the first time it is working fine,but when you try to second time in the same browser(IE6) its not work.

This is becuse Internet Explorer will also cache dynamic pages and this is a problem because the URL of the page may not change but the content will.A workaround for this situation can be achieved by adding a unique time stamp or random number, or possibly both, typically using the Date object and/or Math.random() such as url=url+"&sid=test"+Math.random();.

As for example:

function GetEmailId()
{
var url="http://server.com/test.aspx";
url=url+"&sid=test"+Math.random();
xmlhttp.onreadystatechange=statechangedLogin;
xmlhttp.open("GET", url, true);
xmlhttp.send(null);
}

For simple document request the query string delimiter '?' can be used, or for existing queries a final sub-query can be added after a final '&' – to append the unique query term to the existing query. The downside is that each such request will fill up the cache with useless (never reused) content that could otherwise be used for other cached content (more useful data will be purged from cache to make room for these one-time responses).

A better workaround can be achieved by adding meta tags to dynamic pages in order to make them no-cachable:

<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="-1" />

For more info please visit:
http://en.wikibooks.org/wiki/JavaScript/XMLHttpRequest
http://blogs.msdn.com/ie/archive/2006/01/23/516393.aspx
http://stackoverflow.com/questions/1229821/problem-using-ajax-call-in-ie6-and-ie7-i-am-asking-the-same-question-again-ca

scrollTop not work in IE6

scrollTop problem in IE6
I face a lots of problem ie6.Now I want to share one with you and how to solve it.
Hope that it may helps you.
divObj.scrollTop=0 moves to top of the div but it is not working in IE6.

To solve this you can use:

divObj.scrollTop = divBody.offsetTop; //for scroll to top of the div
divObj.scrollHeight = divBody.offsetHeight; //for scroll to bottom of the div

for more info please visit:
http://radio.javaranch.com/pascarello/2005/12/14/1134573598403.html

Problem with Session StateServer mode

StateServer mode stores session state in a process, referred to as the ASP.NET state service, that is separate from the ASP.NET worker process or IIS application pool. Using this mode ensures that session state is preserved if the Web application is restarted and also makes session state available to multiple Web servers in a Web farm.

But new user are facing problem with this Session state mode.

First ensure to use StateServer mode, you must first be sure the ASP.NET state service is running on the server used for the session store. The ASP.NET state service is installed as a service when ASP.NET and the .NET Framework are installed.

The ASP.Net state service is installed at the following location:
systemroot\Microsoft.NET\Framework\versionNumber\aspnet_state.exe
To configure an ASP.NET application to use StateServer mode, in the application's Web.config file do the following:
1.Set the mode attribute of the sessionState element to StateServer.
2.Set the stateConnectionString attribute to tcpip=serverName:42424.

Example:
<configuration>
<system.web>
<sessionState mode="StateServer"
stateConnectionString="tcpip=SampleStateServer:42424"
cookieless="false"
timeout="20"/>
</system.web>
</configuration>


Problem:
"Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection. If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name.

Solution:
Main solution is allow remote connection from registry.
To allow remote connection:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection set value to 1
Restart ASP.NetStateService from systemroot\Microsoft.NET\Framework\versionNumber\aspnet_state.exe.

For more information visit: http://msdn.microsoft.com/en-us/library/ms178586.aspx

ASP.NET AJAX ARCHITECTURE

Microsoft ASP.NET AJAX enables you to quickly create Web pages that include a rich user experience with responsive and familiar user interface (UI) elements. ASP.NET AJAX provides client-script libraries that incorporate cross-browser ECMAScript (JavaScript) and dynamic HTML (DHTML) technologies, and it integrates them with the ASP.NET 2.0 server-based development platform. By using ASP.NET AJAX, you can improve the user experience and the efficiency of your Web applications.

ASP.NET AJAX Architecture

ASP.NET AJAX consists of client-script libraries and of server components that are integrated to provide a robust development framework. In addition to ASP.NET AJAX, you can use the ASP.NET AJAX Control Toolkit and the features in the ASP.NET AJAX Futures releases, which are both community supported.

AJAX Client-Server Architecture

The ASP.NET AJAX server components basically consists of ASP.NET web server controls and components to manage UI and and flow of an application, and to manage serialization, validation, control extensibility.

ASP.NET Web server controls:

1. ScriptManager : Manages script resources for client components, partial-page rendering, localization, globalization, and custom user scripts.
2. UpdatePanel : Enables you to refresh selected parts of the page, instead of refreshing the whole page by using a synchronous postback.
3. UpdateProgress : Provides status information about partial-page updates in UpdatePanel controls.
4. Timer : Performs postbacks at defined intervals. You can use the Timer control to post the whole page, or use it together with the UpdatePanel control to perform partial-page updates at a defined interval.

ASP.NET AJAX Web Services

ASP.NET AJAX provides Web services that you can use from client script to work with ASP.NET application services for forms authentication and user profiles.

ASP.NET AJAX Client Architecture

The ASP.NET AJAX client-script libraries be made of JavaScript (.js) files that provide features for object-oriented development. The object-oriented features included in the ASP.NET AJAX client-script libraries enable a high level of consistency and modularity in client scripting. The following layers are included in the ASP.NET AJAX script libraries:

• 
  
  A browser compatibility layer. This provides compatibility across the most frequently used browsers (including Microsoft Internet Explorer, Mozilla Firefox, and Apple Safari) for your ASP.NET AJAX scripts.
• 
  
  ASP.NET AJAX core services, which include extensions to JavaScript, such as classes, namespaces, event handling, inheritance, data types, and object serialization.
• 
  
  An ASP.NET AJAX base class library, which includes components such as string builders and extended error handling.
• 
  
  A networking layer that handles communication with Web-based services and applications, and that manages asynchronous remote method calls.
• 
  
  Support for JavaScript libraries that are either embedded in an assembly or are provided as standalone JavaScript (.js) files. Embedding JavaScript libraries in an assembly can make it easier to deploy applications and can solve versioning issues.
• 
  Support for accessing server-based forms authentication and profile information in client script. This support is also available to Web applications that are not created by using ASP.NET, as long as the application has access to the Microsoft AJAX Library.
  

ASP.NET AJAX Control Toolkit

The ASP.NET AJAX Control Toolkit is a collection of samples and components that show you some of the experiences you can create with rich client ASP.NET AJAX controls and extenders. The Control Toolkit provides samples and a powerful SDK to make it simple to create and reuse custom controls and extenders. You can download the ASP.NET AJAX Control Toolkit from the ASP.NET Ajax Web site. The ASP.NET AJAX Control Toolkit is community supported.

For more information:http://www.asp.net/AJAX/Documentation/Live/overview/default.aspx

Reference: asp.net site, wikipedia

How to add checkbox in Gridview in Asp.net

In this article, we shall try discuss about the most powerful and strong feature of Asp.net, GridView. Now we move to our discussion. As a developer and learner of Asp.net I faced a problem several times how to use asp.net sever side controls like, Button, Checkbox, Radio button and others.

Then I try to find out the solution in net. I found lot of information about this query. But I got the accurate information from the asp.net site.

Now I make available information through this site...

In this article discuss how to add a column of radio buttons to the GridView for the purpose of selecting a particular record. A column of radio buttons is a suitable user interface when the user is limited to choosing at most one item from the grid. At times, however, we may want to allow the user to pick an arbitrary number of items from the grid. Web-based email clients, for example, typically display the list of messages with a column of checkboxes. The user can select an arbitrary number of messages and then perform some action, such as moving the emails to another folder or deleting them.

For more information browse: http://www.asp.net/learn/data-access/tutorial-52-cs.aspx
Reference:Asp.net