An overview of how to query a database using LINQ to SQL, courtesy of Microsoft's ASP.NET video series. To learn more about LINQ and Lambda expressions, visit http. All LINQ to SQL queries occur via a DataContext class, which controls the flow of data between the program and the database. A specific DataContext derived. ![]() • Introduction This article provides an introduction to employing LINQ to SQL within a Windows Forms application. The article will address the incorporation of LINQ to SQL into a WinForms project, how to use LINQ to SQL to select, insert, update, and delete data, and how to use LINQ to SQL to execute stored procedures. Select query examples will demonstrate ordering, filtering, aggregation, returning typed lists, returning single objects and values, and how to query across entity sets (which are essentially related tables associated by foreign keys). Ashampoo burning studio offline youtube. Figure 8: Returning a Single Result The preceding examples were intended to provide a simple overview as to how to conduct some basic queries against collections using LINQ to SQL and LINQ to Objects; there are certainly a great number of more complex operations that can be executed using similar procedures (groups and aggregation, joins, etc.), however, the examples provided are representative of some of the more common types of queries. Getting Started There is a single solution included with this download. The solution contains a WinForms project called “LINQSQLCS”; this project contains a form - the main form used to display the results of the demonstration queries ( frmMain), a LINQ to SQL database model ( NorthWindDataClasses.dbml) along with the models designer code and the layout file, and a class, “ Accessor”, which contains the code used to perform the LINQ to SQL queries used in the demonstration. If you open the attached project into Visual Studio 2008, you should see the following in the Solution Explorer. Figure 9: Solution Explorer The demonstration relies upon an instance of the Northwind database running in SQL Server 2005. The database can be downloaded from; the database was created for SQL Server 2000, but you can install the database and attach to it using a local instance of SQL Server 2005. Once the database is installed, you will want to update the connection string found in the project settings. Open the settings and click on the button (showing an ellipsis) to set the connection string. Figure 11: Adding LINQ to SQL Classes to a Project When starting from scratch, in order to add LINQ to SQL to a project, open the “Add New Item” dialog, and select the LINQ to SQL Classes item (Figure 11); name the data classes and then select the “Add” button to add the item to the project. Once set, set the connection string for the data classes, and then open the Server Explorer to drag tables and stored procedures onto the designer (dragging the tables into the left hand side of the workspace and stored procedures into the right hand side of the workspace (Figure 12)). Once that is done, build the project to generate the LINQ to SQL code. 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