Error attaching entity of id when trying to update MVC5

Hi,

I am getting error whed trying to update table.

public static int Partner_AddUpdate(Partner t_Entity)
{
int retValue = -1;
using (var t_Context = new ReboxEntities())
{
using (var transaction = t_Context.Database.BeginTransaction())
{
try
{
if (t_Entity.idPartner > 0)
{
Partner t_EntityModified = t_Context.Partners.Single(m => m.idPartner == t_Entity.idPartner);
t_Entity.LoginName = t_EntityModified.LoginName;
t_Entity.Password = t_EntityModified.Password;
t_Entity.PartnerTypeName = t_EntityModified.PartnerTypeName;
t_Entity.IncorporationType = t_EntityModified.IncorporationType;
t_Context.Entry(t_Entity).State = System.Data.Entity.EntityState.Modified;
}
else
{
t_Context.Entry(t_Entity).State = System.Data.Entity.EntityState.Added;
}
t_Context.SaveChanges();
retValue = t_Entity.idPartner;
transaction.Commit();
}
catch (Exception exc)
{
transaction.Rollback();
}
}
}
return retValue;
}

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Abhilash J A9y ago
Sir,

the error shown like that,

"Attaching an entity of type 'Rebox.DAL.Partner' failed because another entity of the same type already has the same primary key value. This can happen when using the 'Attach' method or setting the state of an entity to 'Unchanged' or 'Modified' if any entities in the graph have conflicting key values. This may be because some entities are new and have not yet received database-generated key values. In this case use the 'Add' method or the 'Added' entity state to track the graph and then set the state of non-new entities to 'Unchanged' or 'Modified' as appropriate."
Nitin Sontakke9y ago
Wouldn't it help if you could just care to share the error message as well?