By Tim Leung
Microsoft visible Studio LightSwitch 2011 is a fast program deployment software that shall we energy clients and directors construct data-centric enterprise functions for the machine, cloud, and net in precisely a number of clicks, with out code required. yet extra complicated builders and company clients will starvation for extra: how do you layout complicated monitors? How do you question info utilizing LINQ and different syntax buildings? How do you safe your program?
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If any changes are found, these will be indicated by icons with a red x or exclamation point, as shown in Figure 3-4. info CHAPTER 3 ■ WORKING WITH DATA Figure 3-4. Database Objects Dialog box showing changed items Clicking the Finish button will update all screens and remove controls that are bound to the deleted fields. Any references made to those fields in code will not be updated. If references exist in code, they will become invalid and show up in the Error List window as errors. At this point, you can work your way through the error list and resolve any remaining errors.
LightSwitch relies on a special database called the intrinsic database. This database stores the tables you create within LightSwitch, as well as security details such as login names and security roles. If you want to connect to external data, the data sources you can use include SQL Server, SharePoint 2010, and custom RIA services. The logic tier (or middle tier) is responsible for performing data access and processing. LightSwitch creates a data service for each data source in your application.
Lsml (LightSwitch Markup Language) file (mentioned in Chapter 1) is the most important file in LightSwitch. The definition and details of screens and queries are defined in this file. You’ll find this file in the Data folder. All other projects in the solution reference this file. lsml file in the Data folder, and a reference to it in the Server project. Figure 2-3. lsml file contains so much content, it often causes contention when multiple developers are working together on a project through source control.