Getting the key value of appSettings from a different config files

[BILL4]

I have a config file named Refer.config which contains the appSettings as:\[code\]<?xml version="1.0"?><configuration><appSettings> <add key="Database" value="http://stackoverflow.com/questions/12793713/CouchDB"/> </appSettings></configuration>\[/code\]Now in the web.config i have referenced it as:\[code\]<appSettings file="C:\Users\312171\Documents\Visual Studio 2008\WebSites\WebSite4\Refer.config"> </appSettings>\[/code\]Now in the cs file i m trying to access the key value of appSettings like this:\[code\]protected void Button2_Click(object sender, EventArgs e) { string filetype = ConfigurationManager.AppSettings["Database"]; testvalue.Text = string.Format("The key value is:",filetype); }\[/code\]But it is not returning the key value...What mistake i have made?? Please help me out..