XML Web service discovery is the process of locating and interrogating XML Web service descriptions. Potential XML Web service clients can learn that an XML Web service exists and how to interact with it by performing a discovery. The .discomap file that is published by an XML Web service is an XML document that typically contains links to other resources that describe the XML Web service. Web sites that implement an XML Web...
Wednesday, April 20, 2011
What is WSDL?
SDL stands for Web Services Description Language.
WSDL is a document written in XML. The document describes a Web service. It specifies the location of the service and the operations (or methods) the service exposes.
Compiled by Rajesh Rol...
What is Endpoints in WCF service
Every service must have Address that defines where the service resides, Contract that defines what the service does and a Binding that defines how to communicate with the service. In WCF the relationship between Address, Contract and Binding is called Endpoint.
The Endpoint is the fusion of Address, Contract and Binding.
in simple language using Endpoint the client application can communicate with your WCF service.
Compiled...
How to use vb6 components in .NET
as we all know vb6 components work on STA and .NET works on MTA.
To use vb6 dll in .net we will have to follow below steps.
- first create dll in vb6.
- you need to register the DLL. Select the Start menu's Run command and execute the statement:
regsvr32 VB6Project.dll
-Next start a Visual Basic .NET project. Select the Project menu's Add Reference command. Click the COM tab and find the DLL or click the Browse button...
Explain STA and MTA
The COM threading model is called an "apartment" model, where the execution context of initialized COM objects is associated with either a single thread (Single Thread Apartment) or many threads (Multi Thread Apartment). In this model, a COM object, once initialized in an apartment, is part of that apartment for the duration of it's runtime.
The STA model is used for COM objects that are not thread safe. That means they do not...
Observer design pattern in .NET
Using Delegates and events we can implement observer design pattern in .net easily.
Delegates and events provides a new and powerful means of implementing the Observer pattern without developing specific types dedicated to support this pattern. In fact, as delegates and events are first class members of the CLR, the foundation of this pattern is incorporated into the very core of the .NET Framework.
References:
http://msdn.microsoft.com/en-us/library/ff648108.aspx
http://msdn.microsoft.com/en-us/library/ee817669.aspx
Compiled...
Encapsulation
It means that in Object-Oriented approach, an object is encapsulated from any other object there is. Everything inside an object, cannot be "touched" (accessed) by any other object within the program, unless it is permitted to be.
So whenever we want any property of an object (constants, variables, functions, or procedures) to be revealed to others, we just have to set it as a "Public" property (usually done by typing the word...
Is it possible to change access specifier of members of interface.
AS we all know interface is publicly exposed contract, so its all functions are public by default because its made to be used by other. we cannot make method of interface as private/protected. and if your requirement is like that you are to create a protected member then my friend you are on wrong boat, You should go for abstract class instead of interface.
Compiled By Rajesh Rol...
What is difference between static class and singleton
Singleton and Static classes both provide a central point of access i.e. there's only one instance and one way to access it.
The benefit of Singleton class is it is much more flexible that static classes. Static classes once defined could not accomodate any future design changes as by design static classes are rigid and cannot be extended.
Singleton on the other hand provides flexibility and also provides sort of a mechanism...
What is difference between abstract factory and factory method.
As both belong from creational design patterns. In short they hide the
complexity of creating objects.
The main difference between factory and Abstract factory is factory method uses
inheritance to decide which object has to be instantiated. While abstract factory uses
delegation to decide instantiation of object. We can say Abstract factory uses factory
method to complete the architecture. Abstract Factory is one level higher...
What is difference between Abstract Class and Interface.
An Abstract class without any implementation just looks like an Interface; however there are lot of differences than similarities between an Abstract class and an Interface. Let's explain both concepts and compare their similarities and differences.
What is an Abstract Class?
An abstract class is a special kind of class that cannot be instantiated. So the question is why we need a class that cannot be instantiated? An abstract...
Monday, April 18, 2011
Inverview at HCL
Technical Interview.
Q: What is difference between abstract factory and factory method.
A: http://dotnetacademy.blogspot.com/2011/04/what-is-difference-between-abstract_20.html
Q: What is difference between static class and singleton.
A: http://dotnetacademy.blogspot.com/2011/04/what-is-difference-between-static-class.html
Q: What is difference between abstract class and interface.
A: Difference between interface and interface
Q:...
Friday, April 15, 2011
Common Interview Questions
Tell me about yourself:The most often asked question in interviews. You need to have a short statement prepared in your mind. Be careful that it does not sound rehearsed. Limit it to work-related items unless instructed otherwise. Talk about things you have done and jobs you have held that relate to the position you are interviewing for. Start with the item farthest back and work up to the present.
Why did you leave your last...
Thursday, April 7, 2011
Create CSV/Excel file in C#
Export GridView data in Excel Export datatable's data in Excel Export Data in Excel using Asp.net using below code you can export data in .csv file which can be opened in excel.
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Collections.Generic;
using...
Monday, April 4, 2011
What is use of === and !== in javascript
=== and !== are strict comparison operators:
JavaScript has both strict and type-converting equality comparison. For strict equality the objects being compared must have the same type and:
Two strings are strictly equal when they have the same sequence of characters, same length, and same characters in corresponding positions.
Two numbers are strictly equal when they are numerically equal (have the same number value). NaN is...
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