My Distinct query is working fine, but I need to put a WHERE clause in another method. LINQ query with Distinct and WHERE clause. Ask Question 0. LINQ to SQL Where Clause Optional Criteria. When to use.First and when to use.FirstOrDefault with LINQ? What is the Java equivalent for LINQ.

Last month I started a blog post series covering LINQ to SQL. LINQ to SQL is a built-in O/RM (object relational mapping) framework that ships in the.NET Framework 3.5 release, and which enables you to easily model relational databases using.NET classes. You can then use LINQ expressions to query the database with them, as well as update/insert/delete data from it. Sniff n the tears fickle heart rar. Below are the first two parts of my LINQ to SQL series: • • In today's blog post I'll be going into more detail on how to use the data model we created in the post, and show how to use it to query data within an ASP.NET project. Northwind Database Modeled using LINQ to SQL In of this series I walked through how to create a LINQ to SQL class model using the LINQ to SQL designer that is built-into VS 2008. Below is the class model that we created for the Northwind sample database: Retrieving Products Once we have defined our data model classes above, we can easily query and retrieve data from our database.

LINQ to SQL enables you to do this by writing LINQ syntax queries against the NorthwindDataContext class that we created using the LINQ to SQL designer above. For example, to retrieve and iterate over a sequence of Product objects I could write code like below: In the query above I have used a 'where' clause in my LINQ syntax query to only return those products within a specific category. I am using the CategoryID of the Product to perform the filter.

One of the nice things above LINQ to SQL is that I have a lot of flexibility in how I query my data, and I can take advantage of the associations I've setup when modeling my LINQ to SQL data classes to perform richer and more natural queries against the database. For example, I could modify the query to filter by the product's CategoryName instead of its CategoryID by writing my LINQ query like so: Notice above how I'm using the 'Category' property that is on each of the Product objects to filter by the CategoryName of the Category that the Product belongs to. This property was automatically created for us by LINQ to SQL because we modeled the Category and Product classes as having a many to one relationship with each other in the database. For another simple example of using our data model's association relationships within queries, we could write the below LINQ query to retrieve only those products that have had 5 or more orders placed for them: Notice above how we are using the 'OrderDetails' collection that LINQ to SQL has created for us on each Product class (because of the 1 to many relationship we modeled in the LINQ to SQL designer). Visualizing LINQ to SQL Queries in the Debugger Object relational mappers like LINQ to SQL handle automatically creating and executing the appropriate SQL code for you when you perform a query or update against their object model.

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One of the biggest concerns/fears that developers new to ORMs have is 'but what SQL code is it actually executing?' One of the really nice things about LINQ to SQL is that it makes it super easy to see exactly what SQL code it is executing when you run your application within the debugger. Starting with Beta2 of Visual Studio 2008 you can use a new LINQ to SQL visualizer plug-in to easily see (and test out) any LINQ to SQL query expression. Simply set a breakpoint and then hover over a LINQ to SQL query and click the magnify glass to pull up its expression visualizer within the debugger: This will then bring up a dialog that shows you the exact SQL that LINQ to SQL will use when executing the query to retrieve the Product objects: If you press the 'Execute' button within this dialog it will allow you to evaluate the SQL directly within the debugger and see the exact data results returned from the database: This obviously makes it super easy to see precisely what SQL query logic LINQ to SQL is doing for you. Note that you can optionally override the raw SQL that LINQ to SQL executes in cases where you want to change it - although in 98% of scenarios I think you'll find that the SQL code that LINQ to SQL executes is really, really good. Databinding LINQ to SQL Queries to ASP.NET Controls LINQ queries return results that implement the IEnumerable interface - which is also an interface that ASP.NET server controls support to databind object. What this means is that you can databind the results of any LINQ, LINQ to SQL, or LINQ to XML query to any ASP.NET control.