) Server. mappath namespace

Friends who are familiar with access know that the ACCESS database is often written as follows:
Strcon = "provider = Microsoft. Jet. oledb.4.0; Data Source =" + server. mappath ("datebase/indexdb. mdb ");
Use server. mappath to obtain the application. ProgramPhysical path! If you write a link statement in a class of the current web project, you may be prompted that the server cannot be found because the complete path of the server is system. Web. httpcontext. Current. server. Using system. web is obviously not enough, but server can be directly written into the class inherited from the built-in page class. mappath "data. mdb "), it should be because the page class already contains these class paths.
If you execute this statement from the class inherited by the page class, you can simply use
Database = server. mappath ("data. mdb ");
Otherwise, write the full namespace: system. Web. httpcontext. Current. server. mappath ();
Note: to add using system. Web to a class under a class library, the using system. Web is not introduced by default when a class library is created!