Asp.Net C#: Interview Questions

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<span style="color: #3d85c6;"><b><span style="font-family: Trebuchet MS,sans-serif;">Introduction:</span></b></span> In this article i am going to explain <span class="IL_AD" id="IL_AD1">the
difference</span> between String and StringBuilder class in ASP.NET with C# and When
to use String and when to use StringBuilder and why? It is one of <span class="IL_AD" id="IL_AD3">the important</span>
interview questioned asked in interview.<br />
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<b>String </b>and <b>StringBuilder </b>class are used to handle the
<span class="IL_AD" id="IL_AD6">strings</span> but there are subtle differences between these two.</div>
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Let's understand the difference between String and
StringBuilder using suitable example:</div>
<a href="https://www.blogger.com/null" name="more"></a><br />
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<b>1. Performance of StringBuilder is high as compared to
String</b></div>
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Consider the following concatenation example:</div>
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String str= "";<br />
str += "Welcome ";<br />
str += "to ";<br />
str += "webcodeexpert.com";</div>
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Output string will be Welcome to webcodeexpert.com</div>
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Let's do the same concatenation operation using
StringBuilder class</div>
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StringBuilder sb = new StringBuilder("");<br />
sb.Append("Welcome");<br />
sb.Append("to ");<br />
sb.Append("webcodeexpert.com");<br />
String str = sb.ToString();</div>
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Output string will be Welcome to webcodeexpert.com</div>
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Have you noticed the result using String and StringBuilder
is same; then what is the difference between these two? The difference is in
their performance. Whenever we concatenate new string to the old string then String
class always create new object of string <span class="IL_AD" id="IL_AD7">type in</span> memory where as when you
use string builder class for that purpose, it updates string at <span class="IL_AD" id="IL_AD2">one place</span> in
memory and does not create new space in memory. </div>
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So obviously StringBuilder
consumes less memory thus perform faster operation. So it is always recommended
to use StringBuilder class for operations that manipulate strings. StringBuilder
will give better performance as compared to String when concatenating the
strings like shown above in example.</div>
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2) From the above point it is clear that <b>String consumes
more memory as compared to StringBuilder</b></div>
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3)  String
Concatenation can be done using '<b>+</b>' operator or using the <b>String.Concat</b> method
whereas <span class="IL_AD" id="IL_AD8">in case of</span> StringBuilder we use <b>Append()</b> method to
concatenate.</div>
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4) <b>String is Immutable (Non Modifiable) whereas
StringBuilder is a Mutable Class</b></div>
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<b>String is immutable</b> i.e. the value stored in the String
object cannot be changed. We cannot change it after creating it. Every
time we use one of the methods in the System.String class that manipulate the
string, we are actually creating a new string object in memory, which requires
a new allocation of space for that new object. Internally a new String object
is created each time whenever we do the changes. </div>
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For example, when we use the
"String" object to concatenate two strings, the first string is
concatenated to the other string by creating a new copy in the memory as a
string object, and then the old string is deleted so we can say when we create
a string we can never change it, rather it will create a new string to store
the new value. </div>
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Hence it can cause performance issue in situations where we need
to perform repeated modifications to the string because overhead associated
with creating a new String object can be costly.</div>
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<b>StringBuilder is mutable</b>. By mutable we mean that we can
perform the operations that manipulate the string without creating the new
StringBuilder object each time.</div>
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For example, using the StringBuilder class can boost
performance when concatenating many strings together in a loop. So StringBuilder
is more efficient if large amounts of string manipulations have to be
performed.</div>
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4) String class belongs to the namespace <b>System</b> while
StringBuilder class belongs to the namespace <b>System.Text</b>.</div>
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5) When string concatenation takes place, additional memory
will be allocated whereas in case of StringBuffer additional memory will be
allocated only when the string buffer capacity exceeds.</div>
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<span style="color: #3d85c6;"><b><span style="font-family: Trebuchet MS,sans-serif;">When to use String or StringBuilder Class?</span></b></span></div>
For simple String manipulations we can
use String class. But for large string manipulations it is
recommended to use StringBuilder class.</div>

Difference between String and StringBuilder class in Asp.Net C#

Introduction: In this article i am going to explain the difference between String and StringBuilder class in ASP.NET with C# an...

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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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<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;">
<span style="font-family: "Verdana","sans-serif"; font-size: 10pt;"><br />
</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>
</td>  </tr>
</tbody></table>
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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;">
<br /></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></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>
</td>  </tr>
</tbody></table>
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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>
<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>
</td>   <td style="border: none; height: 20.1pt; padding: 0in 0in 0in 0in;"><br /></td>  </tr>
</tbody></table>
<div class="MsoNormal">
<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>
</div>

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...