In .NET Framework 3.5 we released several LINQ providers, including LINQ to SQL which set the bar for a great programming model with LINQ over relational databases.
closed as general reference by RegDwigнt♦ Mar 5 '13 at 10:02
This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.
To set the bar means to set a standard. The example you gave means that LINQ to SQL sets the standard for good programming models. In more detail, it means that LINQ to SQL is an example of a good programming model, and that other programming models should be as good as or better than LINQ to SQL.