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Discuss the difference between constants and read-only variables. While constants and read-only variable share many similarities, there are some important differences: Constants are evaluated at compile time, while the read-only variables are evaluated at run time. Constants support only value-type variables (the only exception being strings), while read-only variables can hold reference-type variables. Constants should be used when the value is not changing during run time, and read-only variables are used mostly when their actual value is unknown before run time. Read-only variables can only be initialised at the time of declaration or in a constructor. Explain what LINQ is. LINQ is an acronym for Language Integrated Query, and was introduced with Visual Studio 2008. LINQ is a set of features that extends query capabilities to the .NET language syntax by adding sets of new standard query operators that allow data manipulation, regardless of the data source. Supported