Question

Is it possible to call a function in Global.asax from a class libray project which is present in the same solution?

Answer 1

To access the app settings in web.config from your code, just add the following code:

using System.Configuration;

...

string appVersion = ConfigurationManager.AppSettings["AppVersion"];

It assumes, your web.config contains the following section:

<appSettings>
    <add key="AppVersion" value="1.0.1"/>
</appSettings>

If the System.Configuration namespace is not known, then you have to add a reference to System.Configuration.