Have model contain field without adding it to the database? [closed]

Just decorate your field/property with [NotMapped].

For example:

public class MyModel
{
    public int Id { get; set; }
    public string Name { get; set; }

    [NotMapped]
    public string Type { get; set; }
}

See http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.schema.notmappedattribute.aspx