asp.net mvc - MVC 5 EF 6 Insert Multiple Rows SaveChanges -

i trying insert multiple rows using following code. savechanges() works first record if fails when tries next one. guess each time trying insert records. not sure if correct or not, , if correct how can change code make correct. following code: contrroller:

foreach(var m in pms)             {                 _pmservice.addpms(m);             } 

and in _pmservice.addpms:

_pmrepository.add(pm); _pmrepository.savechanges(); 

_pmrepository.add (actually baserepository , pmrepository extends base)

 _ctx.set<t>().add(entity); 

finally, here savechanges() (again baserepostiroy)

    _ctx.changetracker.detectchanges();     return _ctx.savechanges();  

so in controller, looping through each entry, , calling add. add in service calls add in baserepository , savechanges(). first record works without issues 2nd record onwards fails. , following error:

"saving or accepting changes failed because more 1 entity of type xxxxxxxxxxxxx have same primary key value. ensure explicitly set primary key values unique. ensure database-generated primary keys configured correctly in database , in entity framework model. use entity designer database first/model first configuration. use 'hasdatabasegeneratedoption\" fluent api or 'databasegeneratedattribute' code first configuration."

and using databasefirst approach.

i found answer storegeneratedpattern. had set identity in edmx file primary key field , worked.

storegeneratedpattern="identity"