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Over the last few weeks I've been writing a series of blog posts that cover LINQ to SQL.
LINQ to SQL is a built-in O/RM (object relational mapper) that ships in the . NET (like the Object Data Source and SQLData Source controls that shipped with ASP. NET UI controls to LINQ to SQL data models super easy.
If it is commonplace for multiple users to be modifying the same set of data, you should consider implementing some form of concurrency control.
There are two flavors of concurrency control: optimistic and pessimistic.
In three-tier client server architecture we would normally have the database layer, business logic layer and presentation layer.
The business logic layer is essentially the layer we interact with the Object Data Source.
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I could then point a Grid View at it (by settings its Data Source ID property) to get a grid-like view of the Product content: Without having to-do anything else, I can run the page and have a listing of my Product data with built-in support for paging and sorting over the data.
Use one of the following methods to bind the Grid View control to the appropriate data source type: Note: This control can be used to display user input, which might include malicious client script.
The following table lists the different column field types that can be used. The Grid View control can be bound to a data source control (such as the Sql Data Source control or Object Data Source control) or to any data source collection that implements the IEnumerable interface, such as Data View, Array List, List`1, or other collection types.
NET 2.0 introduced a number of new Web controls designed for accessing and modifying data.
These controls allow page developers to declaratively access and modify data without writing any code to perform the data access. ) Because multiple users can visit the same web page concurrently, it is possible for a user visiting a data modification page to inadvertently overwrite the modifications made by another user. If two users visit this page simultaneously from different computers and both edit the same row, whomever saves the first will have her changes overwritten by whomever saves the row last. For more information, see Introduction to the Validation Controls. Validation server controls are also provided to assess user input.These policies may add friction to the end user's data entry experience.