Expression tree is the construct that has been developed for remote LINQ model. In a nutshell expression trees provide a separation layer between data source and run time. With the help of avisitor pattern expression tree is interpreted in run time and query object is translated into the presentation that is understandable to the data source. In case of LINQ-to-SQL, expression trees are translated into SQL with column names mapped from XML configuration. The SQL query is sent to the database and the result undergoes similar translation procedure but in the opposite direction.
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