300+ Asp.net FAQs and Answers [Experienced / Freshers]

If you want to NOT keep the ViewState, include the directive <%@ Page Enable View State="false"%> at the top of an .Aspx page If you do no longer want to maintain Viewstate for any control add the attribute Enable View State=”fake” to any manage.

Question: 30. Where Can I Get The Details On Migration Of Existing Projects Using Various Technologies To Asp.Internet?

Answer:

Microsoft has designed Migration Assistants to assist us convert existing pages and applications to ASP.NET. It does not make the conversion system completely automatic, however it will accelerate undertaking with the aid of automating some of the steps required for migration. Below are the Code Migration Assistants
•ASP to ASP.NET Migration Assistant
•PHP to ASP.NET Migration Assistant
•JSP to ASP.NET Migration Assistant

Question: 31. What Is The Equivalent Of Date() And Time() In Asp.Internet?

Answer:

VB.NET
System.DateTime.Now.ToShortDateString()
System.DateTime.Now.ToShortTimeString()

C#
System.DateTime.Now.ToShortDateString();
System.DateTime.Now.ToShortTimeString();

Question: 32. How To Prevent A Button From Validating It’s Form?

Answer:

Set the CauseValidation belongings of the button control to False.

Question: 33. How To Get The Ip Address Of The Host Accessing My Site?

Answer:

VB.NET
Response.Write (Request.UserHostAddress.ToString ())

C#
Response.Write (Request.UserHostAddress.ToString ());

Windows CE .NET Interview Questions
Question: 34. How To Access The Parameters Passed In Via The Url?

Answer:

Call the Request.QueryStringmethod passing within the key. The method will return the parameter value associated with that key. VB.NET
Request.QueryString(“id”)

C#
Request.QueryString[“id”];

Question: 35. How To Display A Wait Page While A Query Is Running?

Answer:

Refer Asynchronous Wait State Pattern in ASP.NET.

Question: 36. How To Implement Form Based Authentication In Asp.Internet Application?

Answer:

For
•VB.NET
•C#

Dot Net Framework Interview Questions
Question: 37. Is There A Method Similar To Response.Redirect That Will Send Variables To The Destination Page Other Than Using A Query String Or The Post Method?

Answer:

Server.Transfer preserves the cutting-edge page context, so that inside the goal web page you can extract values and such. However, it could have side results; due to the fact Server.Transfer doesnt’ go through the browser, the browser doesn’t replace its records and if the user clicks Back, they visit the page preceding to the supply page.
Another way to skip values is to use something like a LinkButton. It posts back to the source page, wherein you can get the values you want, put them in Session, and then use Response.Redirect to switch to the target web page. (This does soar off the browser.) In the target page you can read the Session values as required.

Question: 38. What Are The Differences Between Html Versus Server Control?

Answer:

Refer
•ASP.NET Server Controls Recommendations
•Introduction to ASP.NET Server Controls

Question: 39. How Can I Change The Action Of A Form Through Code?

Answer:

You can not change it. The movement characteristic is owned via ASP.NET. Handle Events and Transfer.

Question: 40. Is There Any Control That Allows User To Select A Time From A Clock – In Other Words Is There A Clock Control?

Answer:

Peter Blum has developed a few controls. Check out Peter’s Date Package: TimeOfDayTextBox and Duration Text Box Controls.

Asp Dot Net Mvc 4 Interview Questions
Question: 41. How To Work With Timespan Class?

Answer:

VB.NET
Dim adate As DateTime = DateTime.Parse(“06/24/2003”)
Dim bdate As DateTime = DateTime.Parse(“06/28/2003”)
Dim ts As New TimeSpan(bdate.Ticks – adate.Ticks)
Response.Write(ts.TotalDays & “”)
Response.Write(ts.TotalHours & “:” & ts.TotalMinutes & “:” & ts.Total Seconds & “:” & ts.TotalMilliseconds)

C#
DateTime adate = DateTime.Parse(“06/24/2003”);
DateTime bdate = DateTime.Parse(“06/28/2003”);
TimeSpan ts = new TimeSpan (bdate.Ticks – adate.Ticks);
Response.Write(ts.TotalDays.ToString () + “”);
Response.Write(ts.TotalHours.ToString() + “:” + ts.Total Minutes. ToString() + “:” + ts.Total Seconds.ToString() + “:” + ts.Total Milli seconds.ToString() );

Question: forty two. Where Can I Get Information On Cookies In Asp.Net?

Answer:

Refer Mike Pope’s article Basics of Cookies in ASP.NET.

Asp Dot Net Mvc Interview Questions
Question: 43. Does Asp.Net Still Recognize The Global.Asa File?

Answer:

ASP.Net does no longer apprehend the same old ASP international.Asa report. Instead it uses a report named global.Asax with the same – plus additional – capability.

Question: 44. How Should I Destroy My Objects In Asp.Internet?

Answer:

ASP.Net in reality has very strong inner garbage collection. So this isn’t always an problem because it changed into in preceding variations of Active Server Pages.

Question: forty five. Are There Resources Online With Tips On Asp To Asp.Internet Conversions?

Answer:

Microsoft has deisnged The ASP to ASP.NET Migration Assistant assist us convert ASP pages and programs to ASP.NET. It does not make the conversion manner absolutely computerized, however it will speed up assignment via automating a number of the stairs required for migration. The following Code Migration Assistants are discussed inside the link below.
•ASP to ASP.NET Migration Assistant
•PHP to ASP.NET Migration Assistant
•JSP to ASP.NET Migration Assistant

Question: 46. How Do I Publish My Asp.Internet Application To My Isp’s Web Server?

Answer:

Your ISP should first create an IIS application and observe the Front Page Server Extensions to it. Then in Visual Studio.NET, select the “Project enter the URL and pick the FrontPage internet access method. The “Copy Project” function copies all the necessary documents on your ISP’s device on your ASP.NET application to run.

You also can FTP your documents for your ISP net server. But you must recognise which documents to add. 

Question: forty seven. Why Do I Get Error Message “should Not Load Type” Whenever I Browse To My Asp.Internet Web Site?

Answer:

Your code-at the back of files for both your .Aspx or the global.Aspx web page have now not Build Solution” menu, or run the command line compiler.

Question: 48. Will The Webmatrix Sqldatasourcecontrol Work With A Mysql Connection?

Answer:

SqlDataSourceControl helps you to connect and paintings with MS SQL DB, at the same time as AccessDataSourceControl do the same factor however for MS Access DB. Therefore SqlDataSourceControl can’t help you on your MySql connectivity .
For Connectivity with MySql refer Accessing MySQL Database with ASP.NET.

Question: 49. Can I Combine Classic Asp And Asp.Net Pages?

Answer:

No.

ASP pages can run within the identical web site as ASP.NET pages, however you cannot mix in a page. Also ASP and ASP.NET might not percentage their consultation.

Question: 50. What Is The Difference Between Src And Code-behind?

Answer:

Src attribute approach you installation the source code documents and the whole lot is compiled JIT (simply-in-time) as needed. Many people decide on this considering the fact that they do not have to manually fear about compiling and messing with dlls — it simply works. Of direction, the source is now at the server, for absolutely everyone with get right of entry to to the server — but no longer simply each person at the web.

CodeBehind characteristic would not honestly “do” anything, its only a helper for VS.NET to companion the code record with the aspx file. This is vital in view that VS.NET automates the pre-compiling that is more difficult by way of hand, and consequently the Src attribute is also gone. Now there is best a dll to installation, no supply, so it is really higher protected, despite the fact that its always decompilable even then.

Question: 51. How Can I Get The Value Of Input Box With Type Hidden In Code-at the back of?

Answer:

You can set the runat= server for the hidden manipulate and you may use ControlName.Value to get its price in CodeBehind document.

Question: 52. I Have Created A .Net User Control Page (.Ascx) But I Cannot Compile And Run It.

Answer:

User manage (ascx) can not be run on it personal, however you may drag it onto any net web page (aspx) after which run it.

Question: 53. What Is A .Resx File?

Answer:

The .Resx resource record layout consists of XML entries, which specify gadgets and strings interior XML tags. This is beneficial for localization. 

Question: fifty four. Is It Possible To Use A Style Sheet Class Directly On A Control Instead Of Using Inline Or Page-stage Formatting ?

Answer:

Every WebControl derived manipulate has a CssClass assets which lets in you to set it is format to a style sheet.

Question: 55. Can I Recieve Both Html Markup For Page And Code In The Asp.Net Web Page’s Source Code Portion In The Web Browser?

Answer:

No.

The Web browser recieves best HTML markup,No supply code or net manipulate syntax is surpassed back to the internet browser.

Question: 56. Why Can’t I Put <%@ Page Language="c " %> Where At The Top Of An Aspx File And Write My Server-aspect Scripts In C ?

Answer:

The parsers ASP.NET uses to extract code from ASPX files recognize C#, Visual Basic.NET, and JScript.NET. You can write server-facet scripts in any language supported through a .NET compiler.

Question: fifty seven. Asp Pages That Worked Pefectly On Windows 2000 Server And Iis five.0 Do Not Work On Windows 2003 Server With Iis 6.Zero. Asp.Internet Pages Work Fine. Why?

Answer:

Start -> Settings -> Control Panel -> Administrative Tools -> and double clicking IIS Manager.
Go to the Web Service Extensions tab, click Active Server Pages, then press the “Allow” button at the left.

Question: fifty eight. Why Do I Get Error Message “errors Creating Assembly Manifest: Error Reading Key File ‘key.Snk’ — The System Cannot Find The File Specified”?

Answer:

Check the place of the important thing.Snk report relative to the meeting record. Provide an express course or a relative direction.

Question: fifty nine. How To Get Url Without Querystring?

Answer:

VB.NET
Dim stringUri As String = “http://www.Syncfusion.Com/?Id=1&auid=16” Dim weburi As Uri = New Uri(stringUri)
Dim question As String = weburi.Query
Dim weburl As String = stringUri.Substring(zero, stringUri.Length – query.Length)
Response.Write(weburl)

C#
string stringUri = “http://www.Syncfusion.Com/?Id=1&auid=16”; Uri weburi = new Uri(stringUri);
string question = weburi.Query;
string weburl = stringUri.Substring(0, stringUri.Length – query.Length);
Response.Write (weburl);

Question: 60. What Is The Best Way To Output Only Time And Not Date?

Answer:

Use DateTime as follows VB.NET
Response.Write(DateTime.Now.ToString(“hh:mm:ss”))

C#
Response.Write(DateTime.Now.ToString(“hh:mm:ss”));

Question: 61. Do I Have To Compile Code If I Am Changing The Content Of My Aspx.Cs File?

Answer:

Yes if you have used Codebehind=”my.Aspx.Cs”.

If now not  you used src=”my.Aspx.Cs” for your web page statement.

Question: 62. How To Grab The Referring Url?

Answer:

VB.NET
Response.Write ( Request.UrlReferrer.ToString())

C#
Response.Write ( Request.UrlReferrer.ToString());

Question: sixty three. My Asp Code Gives An Error “compiler Error Message: Bc30289: Statement Cannot Appear Within A Method Body. End Of Method Assumed” When Changed To .Aspx?

Answer:

Use a ")

C#
Response.Write("");

Question: seventy eight. How To Validate That A String Is A Valid Date?

Answer:

VB.NET
Dim blnValid As Boolean = False
Try
DateTime.Parse(MyString)
blnValid = True
Catch
blnValid = False
End Try

C#
bool blnValid=fake;
strive

DateTime.Parse(MyString);
blnValid=genuine;

trap

blnValid=fake;

Question: seventy nine. Are Namespaces And Class Names Are Case Sensitive?

Answer:

Namespaces and Class names are case Sensitive. Namespaces imported the usage of the @ Import Directive will reason an error if the ideal case isn't always used.

Question: 80. How To Get The Url Of Page Dynamically?

Answer:

Use Request.Url belongings.

Question: 81. How To Convert User Input In Dmy Format To Mdy?

Answer:

VB.NET
Dim dt As DateTime = DateTime.ParseExact("0299", New String() "My", "M/y", Nothing, System. Globalization. Date Time Styles.None)

C#
DateTime dt = DateTime.ParseExact("0299", new string[] "My","M/y", null,System. Globalization. Date Time Styles.None);

Question: 82. When The User Is Prompted A File Download Dialogbox, If The User Selects "keep" Then The "save As" Dialog Box Is Displayed. Is There Any Way For Me To Retrieve The Filename And Directory Path Specified By The User On The File Download Dialog Box?

Answer:

Clients do now not record data lower back about wherein the person selects to store the content material, so there isn't always an easy manner to do that. Instead, you will need to invite the consumer earlier than the usage of the content-disposition for a file route, after which you may specify the filename parameter for the content-disposition header. Still, the consumer is free to alternate that route when simply downloading.

Question: eighty three. How To Hide Or Show Controls In Server Side Code?

Answer:

In any appropriate occasion write
VB.NET
TextBox1.Visible =no longer TextBox1.Visible

C#
TextBox1.Visible =!TextBox1.Visible;

Question: eighty four. How To Check If The User Is Using A Secure Or Non Secure Connection?

Answer:

The Request Object defines a Property called IsSecureConnection, a good way to indicate whether or not http:// or https:// has been used.

Question: 85. Is It Possible To Write Code In Many Languages In One Asp.Internet Project?

Answer:

You cannot write the code-behind files in special languages inside the identical venture, but you may write the aspx pages and ascx controls in exclusive languages.

Question: 86. What Is The Difference Between Response.Redirect() And Server.Transfer().

Answer:

Response.Redirect

Tranfers the web page manage to the other web page, in different phrases it sends the request to the alternative web page.
Causes the patron to navigate to the page you are redirecting to. In http phrases it sends a 302 response to the customer, and the patron is going wherein it's told.
Server.Transfer

Only transfers the execution to another page and throughout this you may see the URL of the vintage web page given that handiest execution is transfered to new page and now not manage.
Occurs absolutely at the server, no motion is needed with the aid of the client Sometimes for overall performance reasons, the server technique is greater perfect
Question: 87. How To Get The Hostname Or Ip Address Of The Server?

Answer:

You can use both of those:

HttpContext.Current.Server.MachineName
HttpContext.Current.Request.ServerVariables["LOCAL_ADDR"]
The first one should return the name of the gadget, the second one returns the nearby ip cope with.

Note: that call of the device could be special than host, considering your web site can be the use of host headers.

Question: 88. What Is The Meaning Of Validaterequest=actual In .Net Framework1.1?

Answer:

The fee of validateRequest is about to 'proper' via default, because of this that the framework will routinely deny submission of the '<'and'>' characters.

Question: 89. What Is The Different Between <%# %> And <%= %>?

Answer:

The <%# %> is used for databinding where as <%= %> is used to output the result of an expression. The expression internal <%# %> might be done only while you name the page's or manipulate's DataBind method. The expression inside <%= %> will be carried out and displayed as and while it seems inside the page.

Question: ninety. What Permissions Do Asp.Internet Applications Posses By Default?

Answer:

By default ASP.NET Web applications run as ASP.NET consumer. This person has restricted permissions equal to the User Group.

Question: ninety one. How Can I Specify The Relative Path For A File?

Answer:

Suppose you've got following report hierarchy:

default.Aspx
Admin/login.Aspx
Misc/testpage.Aspx

And you're on the login.Aspx and need your user to navigate to the default.Aspx (or testpage.Aspx) document. Then you may use

Response.Redirect ("../default.Aspx").
Response.Redirect ("../Misc/testpage.Aspx").
Question: ninety two. How Can I Specify The "add A File" Input Textbox In A Form To Be Read Only So That The User Can Click On The Browse Button And Pick A File But They Cannot Type Anything Into The Textbox Next To The Browse Button.

Answer:

Question: 93. How To Change The Page Title Dynamically?

Answer:

VB.NET
'Declare Protected WithEvents Title1 As System.Web.UI.HtmlControls. HtmlGenericControl
'In Page_Load Title1.InnerText ="Page 1"

C#
//Declare protected System.Web.UI.HtmlControls.HtmlGenericControl Title1 ;
//In Page_Load Title1.InnerText ="Page 1" ;

Question: 94. Why Do I Get The Error Message "item Must Implement Iconvertible". How Can I Resolve It?

Answer:

The not unusual reason for this mistake is specifying a manipulate as a SqlParameter's Value instead of the manipulate's textual content cost.For instance, if you write code as beneath you'll get the above error:

VB.NET

Dim nameParameter As SqlParameter = command.Parameters.Add ("@call",SqlDbType.NVarChar,50)
nameParameter.Value = txtName

C#

SqlParameter nameParameter = command.Parameters.Add("@call", SqlDbType.NVarChar, 50);
nameParameter.Value = txtName ;

To solve it, specify the manipulate's Text property in place of the manage itself.

VB.NET

nameParameter.Value = txtName.Text

C#

nameParameter.Value =txtName.Text;

Question: 95. Why Is Default.Aspx Page Not Opened If I Specify Http://localhost. I Am Able To View This Page If I Hardcode It As Http://localhost/default.Aspx?

Answer:

If some other default page comes higher within the list, modify the default.Aspx to be the primary entry in the IIS configuration. If you've got more than one websites internal IIS, make sure the configuration is carried out on the proper internet site (or on all websites via applying the configuration on the server-stage the use of the houses dialog, configure WWW provider).

Question: ninety six. Can Asp.Internet Work On An Nt Server?

Answer:

No.

For extra details refer ASP 1.1 model.

Question: 97. Is It Possible To Migrate Visual Interdev Design-time Controls To Asp.Internet?

Answer:

In VS.NET you may go to Tools > Options > Source Control > General and test the checkbox for Get everything when a solution opens. This retrieves the present day version of all answer items when you open the solution.

Question: ninety eight. How To Automatically Get The Latest Version Of All The Asp.Internet Solution Items From Source Safe When Opening The Solution?

Answer:

In VS.NET you could go to Tools > Options > Source Control > General and check the checkbox for Get the whole thing whilst an answer opens.This retrieves the trendy model of all solution gadgets when you open the solution.

Question: 99. How To Make Vs.Net Use Flowlayout As The Default Layout Rather Than The Gridlayout?

Answer:

For VB.NET, visit course C:Program Files Microsoft Visual Studio .NET Vb7 VBWizards WebForm Templates 1033

Change the following line inside the current WebForm1.Aspx

to

For C#, go to route C: Program Files Microsoft Visual Studio .NET 2003 VC# VC# Wizards CSharp WebApp Wiz Templates 1033

Change the following line within the current WebForm1.Aspx

to

Note:Before converting any templates it's an amazing idea to make backup copies of them Or rather than above approach you could change the behavior for brand spanking new documents on a in line with mission basis in Visual Studio by using:

Right clicking at the venture call (Ex: "WebApplication1)" in Solution Explorer, and select "Properties".
From task properties window, beneath Common Properties>Designer Defaults>Page Layout trade "Grid" to "Flow".
Question: one hundred. Can I Use A Datareader To Update/insert/delete A Record?

Answer:

No.

DataReader provides a means of studying a forward-only movement of rows from a database.

Question: a hundred and one. How To Format A Telphone Number In The Xxx-xxx-xxxx Format?

Answer:

VB.NET

Dim Telno As Double = Double.Parse(ds.Tables(zero).Rows(zero)("TelNo"). ToString())
Response.Write(Telno.ToString("###-###-####"))

C#

double Telno= double.Parse(ds.Tables[0].Rows[0]["TelNo"]. ToString());
Response.Write(Telno.ToString("###-###-####"));

Question: 102. Can Two Different Programming Languages Be Mixed In A Single Aspx File?

Answer:

No.

ASP.NET makes use of parsers to strip the code from ASPX files and duplicate it to transient documents containing derived Page training, and a given parser understands only one language.

Question: 103. Can I Use Custom .Internet Data Types In A Web Form?

Answer:

Yes.

Place the DLL containing the type in the software root's bin listing and ASP.NET will mechanically load the DLL while the type is referenced. This is also what happens while you upload a custom manipulate from the toolbox on your internet form.

Question: 104. How Can I Have A Particular Web Page In An Asp.Net Application Which Displays Its Own Error Page?

Answer:

This can be accomplished by using putting the ErroPage attribute of Page Directive or ErrorPage assets of Page Class to the desired Custom Error Page

<%@Page Language="C#" ErrorPage="specificerropage.Htm"%>

In net.Config

Question: one zero five. Describe The Role Of Inetinfo.Exe, Aspnet_isapi.Dll And Aspnet_wp.Exe In The Page Loading Process?

Answer:

inetinfo.Exe is theMicrosoft IIS server walking, dealing with ASP.NET requests among different things.When an ASP.NET request is received (usually a file with .Aspx extension), the ISAPI filter aspnet_isapi.Dll takes care of it by way of passing the request to the actual worker technique aspnet_wp.Exe.

Question: 106. What's The Difference Between Response.Write() Andresponse.Output.Write()?

Answer:

Response.Output.Write() permits you to put in writing formatted output.

Question: 107. What Methods Are Fired During The Page Load?

Answer:

Init()-while the page is instantiated.
Load()-whilst the page is loaded into server memory.
PreRender()-the quick second earlier than the page is exhibited to the person as HTML.
Unload()-while web page finishes loading.
Question: 108. When During The Page Processing Cycle Is Viewstate Available?

Answer:

After the Init() and before the Page_Load(), or OnLoad() for a manipulate.

Question: 109. What Namespace Does The Web Page Belong In The .Net Framework Class Hierarchy?

Answer:System.Web.UI.Page

Question: one hundred ten. Where Do You Store The Information About The User's Locale?

Answer:

System.Web.UI.Page.Culture

Question: 111. What's The Difference Between Codebehind="mycode.Aspx.Cs" Andsrc="mycode.Aspx.Cs"?

Answer:

CodeBehind is applicable to Visual Studio.NET most effective.

Question: 112. What's A Bubbled Event?

Answer:

When you've got a complex manage, like DataGrid, writing an event processing habitual for every object (mobile, button, row, etc.) is pretty tedious. The controls can bubble up their eventhandlers, permitting the principle DataGrid occasion handler to attend to its constituents.

Question: 113. Suppose You Want A Certain Asp.Net Function Executed On Mouseover For A Certain Button. Where Do You Add An Event Handler?

Answer:

Add an OnMouseOver attribute to the button.

Example: btnSubmit.Attributes.Add ("onmouseover","someClient CodeHere();");

Question: 114. What Data Types Do The Rangevalidator Control Support?

Answer:

Integer, String, and Date.

Question: one hundred fifteen. Explain The Differences Between Server-side And Client-facet Code?

Answer:

Server-side code executes at the server. Client-side code executes inside the consumer's browser.

Question: 116. What Type Of Code (server Or Client) Is Found In A Code-behind Class?

Answer:

The solution is server-side code given that code-at the back of is achieved at the server. However, during the code-behind's execution on the server, it can render consumer-aspect code inclusive of JavaScript to be processed within the customers browser. But just to be clean, code-at the back of executes on the server, as a result making it server-side code.

Question: 117. Should User Input Data Validation Occur Server-side Or Client-aspect? Why?

Answer:

All user enter facts validation need to occur at the server at a minimal. Additionally, purchaser-aspect validation may be done wherein deemed appropriate and feasable to provide a richer, more responsive enjoy for the user.

Question: 118. What Is The Difference Between Server.Switch And Response.Redirect? Why Would I Choose One Over The Other?

Answer:

Server.Transfer transfers web page processing from one page directly to the following page with out creating a round-journey again to the client's browser. This presents a quicker response with a little less overhead on the server. Server.Transfer does no longer replace the clients url history list or cutting-edge url. Response.Redirect is used to redirect the consumer's browser to another page or site. This perform as a ride lower back to the customer where the consumer's browser is redirected to the brand new web page. The user's browser history listing is up to date to reflect the new cope with.

Question: 119. Can You Explain The Difference Between An Ado.Net Dataset And An Ado Recordset?

Answer:

Valid answers are:

A DataSet can represent an entire relational database in memory, entire with tables, relations, and perspectives.
A DataSet is designed to paintings with no