How to setup application setting in web.config & read them c#

Why use web.config ?

when your application have some general configs that you want to be able to change them easily without dealing with code compiling, putting them in the web.config file is a wise choice .

How to put setting in web.config ?

Make sure you open the right web.config file .

Choose Web.Debug.config if you want your setting be only available in Debug state.

Choose Web.Release.config if you want your setting be only available in Release state.

Choose Web.config for both states.

put them in the right section

put your key value pair in <appSetting> node like below.

<appSettings>
		<add key="ReturnUrl" value="/Account/ExternalLoginCallback?ReturnUrl=%2fAnalyseTwitter" />
</appSettings>

How to read application setting from web.config

Using System.Web.Configuration name space in the file that you wish to have your application setting and read they key with below syntax.

string UrlValue=WebConfigurationManager.AppSettings["ReturnUrl"];