Assemblies are fundamental building blocks of .Net Framework. They contain the type and resources that are useful to make an application. Assemblies enables code reuse, version control, security and deployment. An assembly consists of: Manifest, Type Metadata, MSIL and resource file.
Assemblies are Private and Shared. Private are used for a single application and installed in application’s install directory or its sub-directory. Shared assembly is one that can be referenced by multiple application and resides in GAC(local cache for assemblies managed by .Net Framework).
gacutil /i myDll.dll can see and %windir%\assembly
Types of assemblies in .NET
Static assemblies: These are the .NET PE files that you create at compile time. You can create static assemblies using your favorite compiler: csc, cl, or vbc.
Dynamic assemblies: These are PE-formatted, in-memory assemblies that you dynamically create at runtime using the classes in the System.Reflection.Emit namespace.
Private assemblies: These are static assemblies used by a specific application.
Public or shared assemblies: These are static assemblies that must have a unique shared name and can be used by any application.
Dynamic assemblies: These are PE-formatted, in-memory assemblies that you dynamically create at runtime using the classes in the System.Reflection.Emit namespace.
Private assemblies: These are static assemblies used by a specific application.
Public or shared assemblies: These are static assemblies that must have a unique shared name and can be used by any application.
What might be best suited to place in the Application_Start and Session_Start:
Application level variables and settings initialization in App_Start
User specific variables and settings in Session_Start
User specific variables and settings in Session_Start
ASP.Net List Controls and differentiate between them?
RadioButtonList, CheckBoxList, DropDownList, Repeater, DataGrid, DataList
Page Life Cycle
Init, LoadViewState, LoadPostBackData, Load, RaisePostBackDataChangedEvent, RaisePostBackEvents, Pre-Render, SaveViewState, Render, Unload, (IpostBackDataChangedEventHandler and IpostBackEventHandler) Error, CommitTransaction, AbortTransaction, Abort
inetinfo.exe, aspnet_isapi.dll aspnet_wp.exe, HttpModules (OutputCache, Session, Authentication, Authorization, Custom Modules Specified) and Then HttpHandlers PageHandlerFactory for *.aspx
inetinfo.exe, aspnet_isapi.dll aspnet_wp.exe, HttpModules (OutputCache, Session, Authentication, Authorization, Custom Modules Specified) and Then HttpHandlers PageHandlerFactory for *.aspx
Role of Global.asax:
Optional file contains the code to handle Application level events raised by ASP.Net or By HttpModule. This file resides in application root directory. Application_Start, _End, _AuthenticateRequest, _Error, Session_Start, _End, BeginRequest, EndRequest. This file is parsed and compiled into dynamically generated class derived from HttpApplication.
What is web.config and machine.config:
machine.config is default configuration for all applications running under this version, located in %WinDir%\Microsfot.Net\Framework\Version. Settings can be overridden by Web.Config for an specific application Web.Config resides in application’s root/virtual root and exists in sub-sequent folders.
What is ViewState and How it is managed, Its Advantages/Benefits?
ViewState is a special object that ASP.NET uses to maintain the state of page and all webcontrols/ServerControls within it. It is in this object preserves the states of various FORM elements during post-backs. It is rendered to client(browser) as a Hidden variable __VIEWSTATE under
3 Types of Session State Modes?
InProc(cookieless, timeout), StateServer (Server, Port stateConnectionString="tcpip=server:port"), SQLServer (sqlconnectionstring) and Off.
Difference between User Control and Custom Control:
CUSTOM Controls are compiled code (Dlls), easier to use, difficult to create, and can be placed in toolbox. Drag and Drop controls. Attributes can be set visually at design time. Can be used by Multiple Applications (If Shared Dlls), Even if Private can copy to bin directory of webApp add reference and use. Normally designed to provide common functionality independent of consuming Application.
How to Manage State in ASP.Net?
Client based: ViewState, QueryString and Cookies Server based: Session, Application.
Different Types of Validators and Validation Controls
RequiredFieldValidator, RangeValidator, RegularExpressionValidator, CompareValidator, CustomValidator, ValidationSummary
Difference Server.Transfer and Response.Redirect
Both ends the processing for the current request immediately. Server.Transfer start executing the another resource specified as parameter without acknowledgement to client(browser) while Response.Redirect intimate client that your requested resource is available at this location and then client request for that resource.
Difference between Server-Side and Client-Side
Server-Side code is executed on web-server and does not transmitted to client, while client-side code executed on client(browser) and is rendered to client along with the content.
Different Types of Directives:
Page, Register, Control, OutputCache, Import, Implements, Assembly, Reference
Authentication and Authorization:
Authentication is identifying/validating the user against the credentials (username and password) and Authorization performs after authentication. Authorization allowing access of specific resource to user.
Different Types of Caching?
Output Caching: stores the responses from an asp.net page. Fragment Caching: Only caches/stores the portion of page (User Control) Data Caching: is Programmatic way to Cache objects for performance.
Boxing and Un-Boxing
Implicit(automatic) conversion of value type to reference type is known as Boxing And Explicit (manual) conversion of Reference type to value type is said to be Un-boxing. (conversion of Integer variable to object type
DLL-HELL
Situations where we have to put same name Dlls in single directory where are Dlls are of different versions.
How does .NET Remoting work?
It involves sending messages along channels. Two of the standard channels are HTTP and TCP. TCP is for LANs only and HTTP can be used on LANs or WANs (internet). TCP uses binary serialization and HTTP uses SOAP (.Net Runtime Serialization SOAP Formatter). There are 3 styles of remote access: SingleCall: Each incoming request is handled by new instance. Singleton: All requests are served by single server object. Client-Activated Object: This is old state-full DCOM model. Where client receives reference to the remote object and keep until it finished with it.
IL Code
An assembly contains the IL code that the CLR executes at runtime. The IL code typically uses types defined within the same assembly, but it also may use or refer to types in other assemblies. There is one caveat: each assembly can have at most one entry point, such as DllMain( ), WinMain( ), or Main( ). You must follow this rule because when the CLR loads an assembly, it searches for one of these entry points to start assembly execution.
Metadata
Metadata is machine -readable information about a resource, or "data about data." Such information might include details on content, format, size, or other characteristics of a data source. In .NET, metadata includes type definitions, version information, external assembly references, and other standardized information. In order for two components, systems, or objects to interoperate with one another, at least one must know something about the other. In COM, this "something" is an interface specification, which is implemented by a component provider and used by its consumers. In .NET, metadata is a common mechanism or dialect that the .NET runtime, compilers, and tools can all use. Microsoft .NET uses metadata to describe all types that are used and exposed by a particular .NET assembly. Metadata includes descriptions of an assembly and modules, classes, interfaces, methods, properties, fields, events, global methods, and so forth. .NET assemblies are deployable units and manifests are the metadata that describes the assemblies.
.NET Framework
.NET framework is an environment that facilitates Object Oriented Programming Model for multiple languages. It wraps Operating System and insulates Software Development from many Operating System specific tasks such as file handling, memory allocation & management. It has two main components CLR (Common Language Runtime) and .Net BCL (Base Class Libraries).
.NET Framework
.NET framework is an environment that facilitates Object Oriented Programming Model for multiple languages. It wraps Operating System and insulates Software Development from many Operating System specific tasks such as file handling, memory allocation & management. It has two main components CLR (Common Language Runtime) and .Net BCL (Base Class Libraries).
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