Get the physical file system path of the Web site's root directory

HttpContext.Current.Request.PhysicalApplicationPath

Content in configuration file:

<configuration> <appSettings> <add key= "connstr" value= "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = "/> <add key=" DataPath value= "App_data/dbnews.mdb"/> </appSettings>

To read the full link string from the configuration file:

String connstr = configurationmanager.appsettings["ConnStr"]. ToString () + httpcontext.current.request.physicalapplicationpath+configurationmanager.appsettings["DataPath"]. ToString ();