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Posted in | at 8:00 AM

What role does the ScriptManager play?

The ScriptManager manages all ASP.NET AJAX resources on a page and renders the links for the ASP.NET AJAX client libraries, which lets you use AJAX functionality like PageMethods, UpdatePanels etc. It creates the PageRequestManager and Application objects, which are prominent in raising events during the client life cycle of an ASP.NET AJAX Web page. It also helps you create proxies to call web services asynchronously.

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Design Patterns

Posted in Labels: | at 7:42 AM

There are three basic classification of patterns Creational, Structural, Behavioral patterns.


Creational Patterns
==============

Abstract Factory:- Creates an instance of several families of classes
Builder :- Separates object construction from its representation
Factory Method:- Creates an instance of several derived classes
Prototype:- A fully initialized instance to be copied or cloned
Singleton:- A class in which only a single instance can exist

Structural Patterns
==============

Adapter:-Match interfaces of different classes.
Bridge:-Separates an object’s interface from its implementation.
Composite:-A tree structure of simple and composite objects.
Decorator :-Add responsibilities to objects dynamically.
Façade:-A single class that represents an entire subsystem.
Flyweight:-A fine-grained instance used for efficient sharing.
Proxy:-An object representing another object.

Behavioral Patterns
===============

Mediator:-Defines simplified communication between classes.
Memento:-Capture and restore an object's internal state.
Interpreter:-A way to include language elements in a program.
Iterator:-Sequentially access the elements of a collection.
Chain of Resp:-A way of passing a request between a chain of objects.
Command:-Encapsulate a command request as an object.
State:-Alter an object's behavior when its state changes.
Strategy:-Encapsulates an algorithm inside a class.
Observer:-A way of notifying change to a number of classes.
Template Method:-Defer the exact steps of an algorithm to a subclass.
Visitor:-Defines a new operation to a class without change.




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TSQL: Concatenate Multiple Rows into String

Posted in Labels: | at 8:35 AM

use Northwind

declare @CategoryList varchar(1000)
select @CategoryList = coalesce(@CategoryList + ‘, ‘, ”) + CategoryName from Categories

select ‘Results = ‘ + @CategoryList

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datatable grouping

Posted in Labels: | at 8:54 PM

Ex : var masterGroups = (from row in dtRetCls.AsEnumerable()
group row by row["GroupDescription"] into groupedTable
select new
{
x = groupedTable.Key
}
).ToList();

Select data rows

DataRow[] drx = dtRetCls.Select("GroupDescription= '" + item.x + "' ");

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Computed Column Specification

Posted in Labels: | at 8:52 PM

Ex :

(((isnull([AuthorizedQtyU1],isnull([InvoiceQtyU1],(0)))-isnull([ReceivedQtyU1],(0)))-isnull([DamagedQtyU1],(0)))-isnull([MissingQtyU1],(0)))

Is Persisted = no

(datediff(minute,[StartTime],[EndTime]))

Is Persisted = no

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filter generic list items

Posted in Labels: | at 2:23 AM

BatchExeProduct batchExeProductObject = batchExeProducts.Find(delegate(BatchExeProduct ep) {return ep.ExecutiveCode == exeCode; });

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Remove cache in asp.net page

Posted in Labels: | at 8:24 PM

So far I've tried the page directive:

@ OutputCache Duration="1" Location="None"

The Meta tags:

<meta http-equiv="Expires" CONTENT="0">

<meta http-equiv="Cache-Control" CONTENT="no-cache">

<meta http-equiv="Pragma" CONTENT="no-cache">

And the code:

Response.ExpiresAbsolute = DateTime.Now

Response.Expires = -1441

Response.CacheControl = "no-cache"

Response.AddHeader("Pragma", "no-cache")

Response.AddHeader("Pragma", "no-store")

Response.AddHeader("cache-control", "no-cache")

Response.Cache.SetCacheability(HttpCacheability.NoCache)

Response.Cache.SetNoServerCaching()

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