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Keywords are predefined, reserved identifiers with special meaning to the compiler. They cannot be used as identifiers in your program without the @ prefix. For example @if is a legal identifier but not the keyword if.

Reflection is a C# language mechanism for accessing dynamic object properties on runtime. Typically, reflection is used to fetch the information about dynamic object type and object attribute values. In REST application, for example, reflection could be used to iterate through serialized response object.

Remark: According to MS guidelines performance critical code should avoid reflection. See https://msdn.microsoft.com/en-us/library/ff647790.aspx

LINQ (Language Integrated Query) is an expression that retrieves data from a data source. LINQ simplifies this situation by offering a consistent model for working with data across various kinds of data sources and formats. In a LINQ query, you are always working with objects. You use the same basic coding patterns to query and transform data in XML documents, SQL databases, ADO.NET Datasets, .NET collections, and any other format for which a provider is available. LINQ can be used in C# and VB.

Provides a convenient syntax that ensures the correct use of IDisposable objects.


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