Question

I need to update more than one update statements, but all should work on automicity i.e update all or none.

on internet and in someother SO Questions i have found how to use Transaction but i didnt’ find any of them saying to update mulitple statements in one transaction.
See below three updates statements, currently there not running under transaction

/// this are my update calls.
var report = reportRepository.Update(reportModel);
var book = bookRepository.Update(bookModel);
var mobile = mobileRepository.Update(mobileModel);

// each Update method for all repository will looks like
public returnModel Update(someModel model)
{
    // assign values from model to entity
    Context.ObjectStateManager.ChangeObjectState(entity,System.Data.EntityState.Modified)
    Context.SaveChanges();
}

Answer 1

You could wrap the updates in a TransactionScope:

using (TransactionScope transaction = new TransactionScope())
{
    var report = reportRepository.Update(reportModel);
    var book = bookRepository.Update(bookModel);
    var mobile = mobileRepository.Update(mobileModel);
    ...
    transaction.Complete();
}