Asp.Net C#

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<b><u><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">Introduction: </span></u></b><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"><br />
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In this article I will explain what application object is and I will explain how we will use application objects in asp.net.</span><br />
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<b><u><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">Description: </span></u></b><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"><br />
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Today I am writing this post to explain about application object in 
asp.net. In one of the interview I got question like what application 
object is and where we will use application object in asp.net. </span></div>
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<a href="https://www.blogger.com/null" name="more"></a><br />
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">What is an application object?</span></b></div>
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<span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">Application
 object is used to store the information and access variables from any 
page in application. Application object is same as session object only 
the difference is session object </span><span style="color: black; font-family: "Verdana","sans-serif"; font-size: 10pt;">is
 used to maintain the session for particular user. If one user enters in
 to the application then session id will create for that particular user
 if he leaves from the application then the session id will deleted. If 
they again enter in to the application they will get different session 
id but application object is same for all users once application object 
is created that application object is used throughout the application 
regardless of user. The information stored in application object 
accessed throughout all the pages in application (like database 
connection information) and we can change the application object in one 
place those changes automatically reflected in all the pages.</span></div>
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<span style="color: black; font-family: "Verdana","sans-serif"; font-size: 10pt;">You can create application objects in <a href="http://www.aspdotnet-suresh.com/2011/05/what-is-use-of-globalasax-file-in.html" target="_blank">Global.asax</a> file and access those variables throughout the application. To know about how to add <a href="http://www.aspdotnet-suresh.com/2011/05/what-is-use-of-globalasax-file-in.html" target="_blank">Global.asax</a> file check the post here </span></div>
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<a href="http://www.blogger.com/post-edit.g?blogID=7805972021499203804&postID=5015032291606456433" name="more"></a><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">Add following code in Global.asax file like this</span></div>
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<table border="1" cellpadding="0" class="MsoNormalTable" style="border: dashed brown 1.0pt; mso-cellspacing: 1.5pt; mso-padding-alt: 0in 0in 0in 0in; mso-yfti-tbllook: 1184;"><tbody>
<tr style="mso-yfti-firstrow: yes; mso-yfti-irow: 0; mso-yfti-lastrow: yes;">   <td style="border: none; padding: .75pt .75pt .75pt .75pt;"><div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0in; mso-layout-grid-align: none; text-autospace: none;">
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</span><span style="background: none repeat scroll 0% 0% yellow; font-family: "Verdana","sans-serif"; font-size: 10pt;"><%</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">@</span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"> <span style="color: #a31515;">Application</span>   <span style="color: red;">Language</span><span style="color: blue;">="C#"</span>   <span style="background: none repeat scroll 0% 0% yellow;">%></span></span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"><</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">script</span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"> <span style="color: red;">runat</span><span style="color: blue;">="server"></span></span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">void</span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"> Application_Start(<span style="color: blue;">object</span>   sender, <span style="color: #2b91af;">EventArgs</span> e) </span></div>
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<span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">{</span></div>
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<span style="color: green; font-family: "Verdana","sans-serif"; font-size: 10pt;">// Code that runs on application   startup</span></div>
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<span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">Application[<span style="color: #a31515;">"UserID"</span>]   = <span style="color: #a31515;">"SureshDasari"</span>;</span></div>
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<span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">}</span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"></</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">script</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">></span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"></span></div>
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<span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">After completion of writing code global.asax file write the following code in <b style="mso-bidi-font-weight: normal;">aspx</b> page </span></div>
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<table border="1" cellpadding="0" class="MsoNormalTable" style="border: dashed brown 1.0pt; mso-cellspacing: 1.5pt; mso-padding-alt: 0in 0in 0in 0in; mso-yfti-tbllook: 1184;"><tbody>
<tr style="mso-yfti-firstrow: yes; mso-yfti-irow: 0; mso-yfti-lastrow: yes;">   <td style="border: none; padding: .75pt .75pt .75pt .75pt;"><div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0in;">
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"><</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">html</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">></span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">  </span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"><</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">head</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">></span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">  </span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"><</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">title</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">></span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">Application Object Sample<span style="color: blue;"></</span><span style="color: #a31515;">title</span><span style="color: blue;">></span>  </span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"></</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">head</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">></span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">  </span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"><</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">body</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">></span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">  </span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"><</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">form</span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"> <span style="color: red;">id</span><span style="color: blue;">="form1"</span>   <span style="color: red;">runat</span><span style="color: blue;">="server"></span>  </span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"><</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">asp</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">:</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">Label</span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"> <span style="color: red;">id</span><span style="color: blue;">="lblText"</span>   <span style="color: red;">runat</span><span style="color: blue;">="server"></</span><span style="color: #a31515;">asp</span><span style="color: blue;">:</span><span style="color: #a31515;">Label</span><span style="color: blue;">></span>  </span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"></</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">form</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">></span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">  </span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"></</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">body</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">></span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">  </span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;"></</span><span style="color: #a31515; font-family: "Verdana","sans-serif"; font-size: 10pt;">html</span><span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">></span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">  </span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"></span></div>
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<span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">After that write the following code in code behind like this</span></div>
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<table border="1" cellpadding="0" class="MsoNormalTable" style="border: 1pt dashed brown; width: 431px;"><tbody>
<tr style="height: 20.1pt; mso-yfti-firstrow: yes; mso-yfti-irow: 0;">   <td colspan="2" style="border: none; height: 20.1pt; padding: .75pt .75pt .75pt .75pt;" valign="top"><div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0in; mso-layout-grid-align: none; text-autospace: none;">
<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">public</span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"> <span style="color: blue;">void</span>   Page_Load(<span style="color: blue;">object</span> sender, <span style="color: #2b91af;">EventArgs</span> e)</span></div>
</td>  </tr>
<tr style="height: 20.1pt; mso-yfti-irow: 1; mso-yfti-lastrow: yes;">   <td style="border: none; height: 20.1pt; padding: .75pt .75pt .75pt .75pt;" valign="top"><div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0in; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">{</span></div>
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<span style="color: blue; font-family: "Verdana","sans-serif"; font-size: 10pt;">this</span><span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">.lblText.Text =  <span style="color: #a31515;">"UserName: "</span> + Application[<span style="color: #a31515;">"UserID"</span>] + <span style="color: #a31515;">"<br>"</span>;</span></div>
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<span style="font-family: "Verdana","sans-serif"; font-size: 10pt;">}</span></div>
</td>   <td style="border: none; height: 20.1pt; padding: 0in 0in 0in 0in;"><br /></td>  </tr>
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<span style="font-family: "Verdana","sans-serif"; font-size: 10pt; line-height: 115%;">Now run your application you will see the application object value in your page. I hope it helps you. </span></div>
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What is an application object and where we use application object in asp.net | application object sample using asp.net

Introduction: In this article I will explain what application object is and I will explain how we will use application objects in asp.n...

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What is an application object and where we use application object in asp.net | application object sample using asp.net