Linq not updating
The idea is that you have wrapper methods for CRUD (and all other data access) in the business layer so you'd write code like this: True this doesn't look much different than using the LINQ objects directly but the big difference is that you get some level of abstraction for the load and update code so you can inject things like tracing and error handling etc.So to implement you might use code like this for the Load: and another routine later on that saves this object (assuming that possibly the context has gone away).That's fine if you use LINQ directly in your UI code but it's not all that great if you use LINQ in the middle tier.
Note also that LINQ to SQL requires the Named Pipes protocol to be enabled. If you expect to take time to process all the results and are not opposed to caching the results, apply To List to the query. LINQ to SQL provides several tools for inspecting the SQL code it generates.
Make sure your connection string is correct and that your SQL Server instance is running. A connection typically remains open until you consume the query results.
Please use the database structure given below, if you want to try the following examples directly.
I am assuming, you already know how to create dbml/linq to sql classes: Being Lin Q as a ORM, it’s quite easy and sql syntax free way to insert data using Lin Q.
I have a stored procedure whose return value is calculated by For more information, see Customizing Operations By Using Stored Procedures. When I try to serialize, I get the following error: "Type ' System.
In this situation, you must create your own entity classes and add the appropriate attributes. I used the toolbox inheritance shape in the Object Relational Designer to connect two entities, but I get errors. Finally, the topic shows how to create an event handler to programmatically set a property before it inserts or updates a database record. For more information, see the following topics: collection.The steps for enabling automatic update, insert, and delete operations are similar to one other, and the procedures in this topic show how to enable all three functions. These values are used only for fields that are defined in the data source but that are not bound in the data control.control to automatically handle update, insert, and delete operations.It also describes how to customize the values that are being updated. I would expect it to be set to the database default. LINQ to SQL handles this situation automatically for identity (auto-increment) and rowguidcol (database-generated GUID) and timestamp columns. LINQ to SQL avoids such injection by using Sql Parameter in queries. This approach prevents malicious commands from being used from customer input. How do I eliminate setters from some properties when I create an object model from a DBML file? Take the following steps for this advanced scenario: Q.Tags: Adult Dating, affair dating, sex dating