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ExecuteQuery : Executes SQL queries directly on the database. It has two overlaoded method: 1.
DataContext.ExecuteQuery(TResult)(String, Object[]) - Executes SQL queries directly on the database and returns objects.
2. ExecuteQuery(Type, String, object[]) - Executes SQL queries directly on the database. ExecuteNonQuery : Use for data manipulation, such as Insert, Update, Delete. For more details visit : http://msdn.microsoft.com/en-us/library/system.data.linq.datacontext.executequery.aspx
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