Attaching an entity of type 'X' failed because another entity of the same type already has the same primary key value

Question

ErrorMessage :

Attaching an entity of type \'FaridCRMData.Models.Customer\' failed because another entity of the same type already has the same prim

Answer 1

You need to detach the local version first and then do the update process

var localEntity = dbContext.Set()
    .Local
    .FirstOrDefault(f => f.Id == theModel.Id);
if (localEntity != null)
{
    dbContext.Entry(localEntity).State = EntityState.Detached;
}
dbContext.Entry(appModel).State = EntityState.Modified;