ActionResult is an abstract class means ViewResult derives from ActionResult.
You declare it this way so you can take advantage of polymorphism and return different types in the same method.
Eg:
public ActionResult Foo()
{
if (someCondition)
return View(); // returns ViewResult
else
return Json(); // returns JsonResult
}
I above example the return type of Foo() is "ActionResult" so now i am not bound to return...
Monday, December 19, 2011
Wednesday, November 23, 2011
Principals Of Design
• Use models to design systems
• Use hierarchical, top-down design
• Work on high-risk entities first
• Prioritize
• Control the level of interacting entities
• Design the interfaces
• Produce satisficing designs
• Do not optimize early
• Maintain an updated model of the system
• Develop stable intermediates
• Use evolutionary development
• Understand your enterprise
• State what not how (polymorphism)
• List functional requirements...
Tuesday, November 8, 2011
New vision, new version, get ready!
Check out the new look and feel of the Experts Exchange site, as far as 15 years ago you could not dream of a full community of experts at your disposal...
So, get ready to the new and improved Experts Exchange.
Get Answers of you every Tech question and make you life easy.
...
Tuesday, October 25, 2011
Advantages of SQL Server 2008 over SQL Server 2005
Transparent Data Encryption. The ability to encrypt an entire database.
Backup Encryption. Executed at backup time to prevent tampering.
External Key Management. Storing Keys separate from the data.
Auditing. Monitoring of data access.
Data Compression. Fact Table size reduction and improved performance.
Resource Governor. Restrict users or groups from consuming high levels or resources.
Hot Plug CPU. Add CPUs on the fly.
Performance...
Sunday, October 16, 2011
Design Patterns which are used in .NET Framework base class library
As we know that .net is an OOPs based language so we can easily implement design patterns in our projects but some times it comes to mind that, which all design patters microsoft .NET Base Class Library is using internally.
NOTE: This question also popular in interviews.
Lets walk through few Design patterns used in .NET BCL:
Observer Pattern:
This observer design pattern is used for delegates and events.
Iterator Pattern:
Iterator...
Tuesday, September 20, 2011
Features of .net framework 4.5
The .Net framework 4.5 has lots of new features and improvements in existing sections like:
.NET for Metro style apps
-The .NET APIs for Metro style apps provide a set of managed types that you can use to create Metro style apps for Windows using C# or Visual Basic.
Core New Features and Improvements
-features and improvements added to the common language runtime and to .NET Framework classes
-Managed Extensibility Framework...
.NET Framework 4.5: Windows Communication Foundation 4.5
Simplification of generated configuration files.
Support for contract-first development.
Ability to configure ASP.NET compatibility mode more easily.
Changes in default transport property values to reduce the likelihood that you will have to set them.
Updates to the XmlDictionaryReaderQuotas class to reduce the likelihood that you will have to manually configure quotas for XML dictionary readers.
Validation of WCF configuration...
.NET Framework 4.5:Windows Presentation Foundation (WPF)
The new Ribbon control, which enables you to implement a ribbon user interface that hosts a Quick Access Toolbar, Application Menu, and tabs.
The new INotifyDataErrorInfo interface, which supports synchronous and asynchronous data validation.
New features for the VirtualizingPanel and Dispatcher classes.
Improved performance when displaying large sets of grouped data, and by accessing collections on non-UI threads.
Data binding...
New features in ASP.NET 4.5
Support for new HTML5 form types.
Support for model binders in Web Forms. These let you bind data controls directly to data-access methods, and automatically convert user input to and from .NET Framework data types.
Support for unobtrusive JavaScript in client-side validation scripts.
Improved handling of client script through bundling and minification for improved page performance.
Integrated encoding routines from the AntiXSS...
.NET Framework 4.5: Asynchronous File Operations
New asynchronous features were added to the C# and Visual Basic languages. These features add a task-based model for performing asynchronous operations. To use this new model, use the asynchronous methods in the I/O classes.
Example of Asynchronous File Operati...
Managed Extensibility Framework (MEF)
The Managed Extensibility Framework (MEF) provides the following new features:
Support for generic types.
Convention-based programming model that enables you to create parts based on naming conventions rather than attributes.
Multiple scope...
.NET Framework 4.5: Features and improvements added to the common language runtime and to .NET Framework classes
Ability to limit how long the regular expression engine will attempt to resolve a regular expression before it times out.
Ability to define the culture for an application domain.
Console support for Unicode (UTF-16) encoding.
Support for versioning of cultural string ordering and comparison data.
Better performance when retrieving resources.
Zip compression improvements to reduce the size of a compressed file.
Ability to...
What are Metro style apps
Metro style apps are full screen apps tailored to your users' needs, tailored to the device they run on, tailored for touch interaction, and tailored to the Windows user interface. Windows helps you interact with your users, and your users interact with your app.
ReadMo...
Saturday, September 10, 2011
How to Protect email address from spam bots/harvesters
What is spam?Spam is flooding the Internet with many copies of the same message, in an attempt to force the message on people who would not otherwise choose to receive it. Most spam is commercial advertising, often for dubious products, get-rich-quick schemes, or quasi-legal services. Spam costs the sender very little to send -- most of the costs are paid for by the recipient or the carriers rather than by the sender.
Email...
Wednesday, September 7, 2011
ASP.NET Interview Questions Page-7
ASP.NET Interview Questions:<< Page6
Why object of abstract class can’t be instantiate
Cast Int to Enum and vice-versa
What is use of “??”.
Do Enum Supports Inharitence
How to get url without parameters/query string
Invoke a Method when method name is in string format or stored in variable
How to: add 'Tweet This' button to Asp.net Webpage/website
What is Bookmarklet / what is use of Bookmarklet
Where does the value of...
ASP.NET Interview Questions Page-6
ASP.NET Interview Questions:<< Page5
Page7 >>
What is difference betwee collections and Generic Collections
How to create custom generic collection
How to default initialize (not at declaring time) static variables of static class
Find all possible combinations of a string
How many type of Events are there (regarding delegates).
What is DHTML and what are its advantages over general HTML
Syntex of declaring Delegate
Get...
ASP.NET Interview Questions Page-5
ASP.NET Interview Questions:<< Page4
Page6 >>
Object can be instantiated or not if Class is private and Constructor is Public
Is it allowed to use virtual keyword with functions in interface
Where will the use of Abstract class is preferred and where Interface will be preferred?
What is difference between Custom Controls and User Controls
What is XHTML? what is its advantages
Arrays are value type or reference type?
When...
ASP.NET Interview Questions Page-4
ASP.NET Interview Questions:<< Page3
Page5 >>
What’s difference between Datagrid , Datalist and repeater
Difference Between Global.asax and web.config file
What method do you use to explicitly kill a user Session
Explain Server side code and Client side code
What is Multi-threading
What is a satellite assembly
What is difference between VB.NET and C#
What is concept of Boxing and Unboxing
What are Value types and...
ASP.NET Interview Questions Page-3
ASP.NET Interview Questions:<< Page2
Page4 >>
How do you debug an ASP.Net Web application?
What is the default Connection Time Out to wait for a connection to open in ASP.Net?
What is serialization in .NET? What are the ways to control serialization?
What exactly happens when ASPX page is requested from Browser
How to enable tracing
What is Tracing in ASP.NET
Show the entire validation error message in a message...
ASP.NET Interview Questions Page-2
ASP.NET Interview Questions:<< Page1
Page3 >>
What is the maximum possible length of a query string?
Refresh Current Page using JavaScript
Refresh Parent Page from Popup/child page
Show Data in Hindi Without Installing Font at Client Side
Difference between <%# Bind(””) %> and <%# Eval(””) %>
Difference between website project and webapplication project in VS2008
14" Toshiba Satellite L645: 2.53GHz...
ASP.NET Interview Questions
interview questions and answers for experienced in .net
interview questions and answers for fresher in .net
ASP.NET Interview Questions:Page2 >>What is use of parameterized constructor in abstract class? As Abstract classes cannot be instantiated?
What is difference between Private and Sealed Classes
What all type of Constants are there in .NET
What is difference between Dictionary and Hashtable
What is DISCO?
Explain ASP.NET...
Sunday, September 4, 2011
Constants in .NET
There are two types of constants available in c#:
Compile-time constants and runtime constants. They have different behaviors and
using wrong one will cost you performance or correctness.
But Runtime constants are always preferable over
compile-time constants. Though the compile-time constants are slightly faster
but they are not flexible with compare to runtime constants.
The compile-time constants are preferable when performance
is...
Wednesday, August 24, 2011
Row/Item Count in Repeater
Using below code you can get Repeater's Row/Item Count:
in below code "Container.ItemIndex" is used to get current row number and
"(string[])rpttags.DataSource).Length" is used to get total row/item count.
in above line my datasource for repeater was a string array so i used string[] as datasourcetype and used length to get its count in same way you can get for all other types
eg:-
<%# (Container.ItemIndex < ((yourDataSourceDataType)rpttags.DataSource).Length...
Monday, August 22, 2011
HTML Encode/Decode using JQuery
using below code you can encode/decode html tags using jquery
function htmlEncode(value){
return $('').text(value).html();
}
function htmlDecode(value){
return $('').html(value).text();
}
Compiled By: Rajesh Rol...
Friday, August 12, 2011
SQL Server parameter sniffing
While working on a project which has huge database interaction and i was using stored procedure to get good performance. But even though i was using stored procedure the performance was not so good all the time. I mean it was not consistent, for few queries on same stored procedure it was so good and some times it was going worst.
I have done lots of google for it and finally i got the solution.. The easiest solution which...
Thursday, August 11, 2011
How to Query for single value for multiple column in fulltext search
Search a value in multiple column using fulltext search:
select * from productmaster where FREETEXT((productName,productDetails),'Search this text')
Compiled By: Rajesh Rol...
show multiple jquery scroller in single page
To show multiple jquery scroller in single page just add an extra div on outer side or every scroller. means place every scroller in seperate div and its done..
Compiled By: Rajesh Rol...
Wednesday, August 10, 2011
What is difference between Dictionary and Hashtable
The fact is that dictionary is a hashtable.
The main difference is that dictionary is a hashtable where as hashtable is not.
That means you get type safety with Dictionary, because you can't insert any random object into it, and you don't have to cast the values you take out.
its almost similar what difference between array list and generic list.
Compiled By: Rajesh Rol...
When caching is enabled for the XmlDataSource that is not in the page's control tree it requires a UniqueID that is unique throughout the application.
XmlDataSource class internally calls a private method called CreateCacheKey. Now, if you are using XmlDataSource without an ID, after upgrading the solution to ASP.NET 3.5, this might throw an exception - "When caching is enabled for the XmlDataSource that is not in the pages control tree it requires a UniqueID that is unique throughout the application." This is due to the absence of the UniqueID (which is read-only, but my experiment...
Tuesday, August 9, 2011
Query Xml File with Namespace using XPath
We all know how to get value from xml file in .net but we face issue when there is a namespace with that xml file.
When a xml file contains a namespace then you will have to do some extra efforts to retrieve its value.
Lets say my xml is like:
Videos
119150
207463
somepath
sometitle
somelink
...
http://someurl/standard-and-poors-india-connection/207463
Tue, 09 Aug 2011 6:26:48 IST
1312894608
Now i wants to access...
Wednesday, August 3, 2011
Handling null values with the Linq Aggregate methods
You can use it like:
var value = (from t in _table
where t.Id == id
&& t.Time >= intervalStartTime
&& t.Time <= intervalEndTime
select (int?)t.Value).Average()
Compiled By: Rajesh Rol...
For translation to SQL, the Math.Round method needs a MidpointRounding parameter. Use 'AwayFromZero' to specify the SQL function ROUND.
Whenever you will try to use Math.Round with LINQ, that time you will face this error:
For translation to SQL, the Math.Round method needs a MidpointRounding parameter. Use 'AwayFromZero' to specify the SQL function ROUND.
To overcome this problem. just do as its saying..
avgRate = Math.Round( (double) rmpd.Average(a => a.reate),1, MidpointRounding.AwayFromZero )
Compiled By: Rajesh Rol...
Tuesday, August 2, 2011
Find all possible combinations of a string
Using below function we can find all possible combinations of any string.
static void Combination(string left, string right)
{
if (right.Length == 1)
{
Console.Write(left);
Console.Write(right);
Console.WriteLine();
return;
}
else
{
for (var index = 0; index < right.Length;...
Monday, August 1, 2011
Convert Integers to Binary, Octal or Hexadecimal
Console.WriteLine(Convert.ToString(value, 2)); // Outputs "10101010"
Console.WriteLine(Convert.ToString(value, 8)); // Outputs "271"
Console.WriteLine(Convert.ToString(value, 16)); // Outputs "b9"
Compiled By: Rajesh Rol...
Friday, July 29, 2011
Send Email from SQL-Server Database
In order to send mail using Database Mail in SQL Server, there are 3 basic steps that need to be carried out. 1) Create Profile and Account 2) Configure Email 3) Send Email.
The following is the process for sending emails from database.
- Make sure that the SQL Server Mail account is configured correctly and enable Database Mail.
- Write a script to send an e-mail. The following is the script.
USE [YourDB]
EXEC msdb.dbo.sp_send_dbmail
@recipients...
How to get @@Error and @ROWCOUNT at the same time?
if @@Rewcount is checked after error checking statement then it will have '0' as the value of @@Recordcount as it would have been reset. and if @@Recordcount is checked before the error-checking statement then @@Error would get reset. To get @@error and @@rowcount at the same time do both in same statement and store them in local variable.
select @recCount = @@Rowcount, @Err = @@error
Compiled By: Rajesh Rol...
Wednesday, July 27, 2011
What is Table Scan?
Table Scan comes to picture when you search for data in a table and you table does't have any index created on it or your query does't take advantage of any existing index of table.
In normal condition Table Scan is not good but in some circumstances its good to use.
A table scan is the easiest and simplest operation that can be performed against a table. It sequentially processes all of the rows in the table to determine if...
Monday, July 25, 2011
ASP.NET Application and Page Life Cycle
Today we are going to learn complete application and page life cycle of asp.net
Beginning from request sent from browser to process and then response sent back to browser.
In broad way there are only 2 step process
- creation of an environment which can process the request
(creation of application object, request, response and context...
Monday, July 18, 2011
Will finally blocks be executed if returning from try or catch blocks
Yes, the finally block is executed however the flow leaves the try block - whether by reaching the end, returning, or throwing an exception.
The return value is determined before the finally block is executed though, so if you did this:
int Test()
{
int result = 4;
try
{
return result;
}
finally
{
// Attempt to change value result
result = 1;
}
}
the value 4 will still be...
Where is session stored if cookie is disabled on client’s machine
The session cookie is a special non-persistant cookie. It's only stored in memory, so in most cases even when cookies are disabled it still works fine.
It's also possible to enable something called cookieless sesssions where the sessionID is embedded in the URL, like this:
http://yourserver/folder/ (encrypted session ID here) /default.aspx
Here's a link to an MSDN article with more details:
http://msdn.microsoft.com/en-u...
Get all column names of datatable into string array
using Linq you can easily get list/array of all column names of a datatable:
string[] columnNames = dt.Columns.Cast< datacolumn > ().Select(x => x.ColumnName).ToArray();
//or in LINQ
string[] columnNames = (from dc in dt.Columns.Cast< datacolumn >() select dc.ColumnName).ToArray();
Compiled By: Rajesh Rol...
LINQ over Datatable
using below code we can use LINQ to query Datatables:
var res = from p in dt.AsEnumerable()
where p.Field< string >("YourFieldName") == "Value" || p.Field < string > ("YourFieldName") == "Value"
select p;
Compiled By: Rajesh Rol...
The query results cannot be enumerated more than once
While doing LINQ you will face this error to resolve it add a ToList() at end of your LINQ query. This way, the results are retrieved from the server, after which you can do with them whatever you want (since they are now loaded in-memory).
Compiled By: Rajesh Rol...
Fastest way to extract number from string
To extract numeric values from string you can use below function:
static string ExtractNumbers(string expr)
{
return string.Join(null, System.Text.RegularExpressions.Regex.Split(expr, "[^\\d]"));
}
Compiled By: Rajesh Rol...
Wednesday, June 29, 2011
Suppose there is two versions of a assembly, how your application will decide which version to use?
In web.config under binding give old version and new versi...
Saturday, June 25, 2011
Why object of abstract class can’t be instantiate
We all knows that object of abstract class can be created but cannot be instantiated, but important question is why its not allowed to instantiate the object of abstract class?
Lets understand it with an example:
public abstract class cal
{
public cal()
{
}
public cal(int a)
{
}
public abstract int add(int a, int b);
}
public class c2
{
cal...
Friday, June 24, 2011
Can we create clustered index on non primary key column
Yes we can create clustered index on non-primary key column but that column must be unique and the primary key column of that table must have non-clustered index.
By default primary key column contains clustered index so its recommended to create such non-primary key clustered index column first and then should create primary key column so in such case the primary key on that column will be with non-clustered.
But its highly...
What is use of parameterized constructor in abstract class? As Abstract classes cannot be instantiated
public abstract class ABC
{
int _a;
public ABC(int a)
{
_a = a;
}
public abstract void computeA();
};
The above question is little bit tricky, it wants to make you confuse by emphasizing on keyword “Abstract”, where as it has got nothing to do with abstract class.
First of all its essential to understand the constructor call chain. Whenever an object of a class created, its constructor gets called and that constructor...
Thursday, June 16, 2011
What is difference between Private and Sealed Classes
Sealed Class:"Sealed" keyword provide us facility to prevent a class to be inherited by other classes, so "Sealed" classes cannot be inherited by any other class.
You can also use the sealed modifier on a method or property that overrides a virtual method or property in a base class. This enables you to allow classes to derive from your class and prevent them from overriding specific virtual methods or properties.
"Sealed"...
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