title: Entity Framework destriong my classes
body: <p>Why when I saving the EDMX file in VS2012, hi always change the attributes of the component classes?
  I use a marker there [NotMapped] with System.ComponentModel.DataAnnotations.Schema and it is always the same clause and using are removed.</p>
  
  <p>EF does not support Agility methodologies?</p>
  
  <p>1) I want to just make simple calculations on the data and display them in the attributes. For example, the document number is the number and prefix.
  2) the model-first and code-first for me is not enough. I create an application based on data from the ERP and I have to add Me own document type. Half of the data is in the database and I can not duplicate it. The other half is my new tables. At the same time I do not know yet where I will use the data and I am not sure what the relationship between them I used. (I can not create a relationship right away in the diagram on the 500 tables). The client does not know yet what the data which depends. Typical thing to Agile methodologies.</p>