Dot Net Component: CLR and Com - Decom
By [http://ezinearticles.com/?expert=Perjej_Munjal]Perjej Munjal
Dot Net have an important component that is CLR. No my point of view its not component, I think it provides runtime environment infrastructure to application. Lets take some overview of it.
First of all we need some source code that needed by CLS. It must be in CLS – complaint languages. Now the next step that comes is, CLS compiles the source code generate the Intermediate code (MSIL) and Meta Data.
The MSIL (Microsoft Intermediate Language) contains some instructions that relates to C.P.U. Just like how to load, store, initialize and call methods on objects. In MSIL instructions are also there just like perform arithmetic and logical operations, memory directly access, flow of execution, handle exception. Because before execution MSIL we need CPU specific instructions. And to execute the code, the runtime requires information about the code that is in metadata.
The Meta Data contains the types and references to other type which is helpful for our applications.
Both of these files located in a PE File(Portable Executable File). When we execute the P.E file the class loader loads the MSIL code and metadata from P.E file to runtime memory. Now works for code manager is covers in existence it call the entry point method. This is any of these three.
. Main
. WinMain
. DLLMain
Entry point is first method that is to be executed first. When entry point is execution code manages helps object to places him in memory and controls the execution in the program. Now garbage collector performs periodic checks on the heap to identity the object, type checker performs types checking. Type checker raise error if any occur. CLR controls the code at runtime. Now security engine performs restriction application. Now Managing Multithreading , Com Marshels performs there roles. Now JIT compiles perform there role and convert all thing to native code.
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DataGrid and GridView in ASP.NET
By [http://ezinearticles.com/?expert=Adam_Sturo]Adam Sturo
ASP.NET version 1.x have one most commonly used Web controls that is DataGrid. DataGrid control helps to display data on an ASP.NET page just like a breeze. we can simply drag and drop the DataGrid on our webpage, we can also specify columns/fields and we can also format that fields and columns. There are some feature of DataGrid that's helps end user to page, sort, and even edit the data within the DataGrid.
After that DataGrid takes a huge improvement over pre-ASP.NET techniques for showing data,But have some limitations till now. For starters, binding any data to a DataGrid still required some code to written, and often repetitive code at that. And something more that how to utilize any of the DataGrid more advanced features-handling deletes, providing pagination, or sorting support-required additional code and time.
ASP.NET 2.0 gernate some facility to fixes the problems of the DataGrid through a set of data source controls designed to manage data that can be bound to data Web controls, and a replacement the DataGrid with GridView control.For accessing data in ASP.NET 1.x, developers need some code.with the help of data source controls,data can be easily accessed through simple syntax in the HTML portion of the ASP.NET Web page.The data source controls can be added to a page by simply dragg and drop.And, the specific data to retrieve can be specified entirely through the Design view. Once a data source control sholud configured, it can be easily bound to a data Web control, just like GridView, by setting the data Web control's DataSourceID property to the ID of the data source control.
Data source controls in ASP.NET 2.0 access data with quicker and easier with compare to to ASP.NET version 1.x.GridView also makes showing that data much simpler than with the DataGrid in ASP.NET version 1.x.
With the GridView you can specify that the data be sortable and/or pageable by simply checking a checkbox.This process is also when Delete column.
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