are you testing the page locally or remotely?
If you are testing remotely, you may not be able to use the Microsoft.ACE.OLEDB.12.0 provider in the connection string. you may need to use Microsoft.Jet.OLEDB.4.0 as the provider.
also, check that the Server.MapPath function is actually locating the database. create a blank ASP JS Page, and add the following code to double check it:
DB Path: <%=Server.MapPath("\\mstest1\\data\\thscData.accdb")%>