It is a transaction or contract whose value depends on or, as the name implies, derives from the value of underlying assets such as stock, bonds, mortgages, market indices, or foreign currencies. One party with exposure to unwanted risk can pass some or all of the risk to a second party. The first party can assume a different risk from a second party, pay the second party to assume the risk, or, as is often the case, create a combination.
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It is an applied predicate calculus specifically tailored for relational databases proposed by E.F. Codd. E.g. of languages based on it are DSL ALPHA, QUEL.
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Proactive Update:
The updates that are applied to database before it becomes effective in real world .
Retroactive Update:
The updates that are applied to database after it becomes effective in real world .
Simulatneous Update:
the updates that are applied to database at the same time when it becomes effective in real world .
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Web forms are very similar to traditional HTML forms. The difference is that Web forms are server-based, meaning you create the user elements on the server. The server has complete knowledge of what the interface looks like, what it can do what data it expects, and so on. Web forms pages are divided into two parts: the visual elements and the accompanying UI logic. These two components are completely separate from each other conceptually, and they can be physically located anywhere you want. Typically, both parts are contained within one .aspx file. The System.Web.UI namescape defines classes and interfaces used in constructing nd rendering elements on a Web form. The most important class in the System.Web.UI is the Control class which defines the properties, methods and events that are common in all server controls in the WebForm framework. Another important class in this namespace is Page which is a derivative of the Control Class. All ASP.NET web pages are instances of derivatives of the Page Class. To have an extensible framework, the System.Web.UI namespace also includes the UserControl class which is similar to Page class except that it is mainly used as the base class for user controls.
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Global.asax is a file used to declare application-level events and objects. Global.asax is the ASP.NET extension of the ASP Global.asa file. Code to handle application events (such as the start and end of an application) reside in Global.asax. Such event code cannot reside in the ASP.NET page or web service code itself, since during the start or end of the application, its code has not yet been loaded (or unloaded).Global.asax is also used to declare data that is available across different application requests or across different browser sessions. This process is known as application and session state management. The Global.asax file must reside in the IIS virtual root.Events and state specified in the global file are then applied to ASP.NET all resources housed within the web application. If, for example, Global.asax defines a state application variable, all .aspx files within the virtual root will be able to access the variable. Like an ASP.NET page, the Global.asax file is compiled upon the arrival of the first request for any resource in the application. The similarity continues when changes are made to the Global.asax file; ASP.NET automatically notices the changes, recompiles the file, and directs all new requests to the newest compilation. A Global.asax file is automatically created when you create a new web application project in the VS.NET IDE.
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