title: Read text data and store in application memory
body: <p>I 'm working on a project that has a database which is in the form of a text file.
  This project is a  web service which answers required data from different users by web method calls.
  The text file for the database would be increasing in size and maybe have the size more that 100 MB
  How can I load this data text file in my whole application in asp.net to the memory and for every request from different users get the data from loaded data in memory? In addition to this is, it possible to add more data to this database variable in the memory and then save the changed data in the memory to the file ?</p>
  
  <p>Thank you
  I appreciate any help.</p>