Accessing Configuration Settings

Use the ConfigurationManager from System.Configuration

var server = ConfigurationManager.AppSettings["FileServerName];

var modulesSection = ConfigurationManager.GetSection("system.web/httpModules") as HttpModulesSection;

var installedModules = modulesSection.Modules.Count;

Configuration Hierarchy

Each application inherits settings from higher level config files

• Machine.config
• Machine web.config
• Parent's web.config
• your web.config

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Check : Web Config Transform