update: due to unknown reason it just worked T_T

On Jun 19, 11:21 am, Erickson <[email protected]> wrote:
> var q = from p in context.SystemUsers
>                         where p.SysUserName == username
>                         select p;
>
> this code also works
>
> On Jun 19, 11:10 am, Erickson <[email protected]> wrote:
>
> > hello, i had this error "Operation is not valid due to the current
> > state of the object" when trying to query using
> > "context.SystemUsers.Single" but when using "context.SystemUsers" all
> > records are retrieve

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