I Cant save or update only some items using a vb.net No error come

Question

i have a very Strange problem and i must solve it very fast i am using sql server 2014 with vb.net 2010 i have 2 tables first one for save items second one for the movement of this items for sell or buy users use it very Well Before yesterday the problem in the purches form all the items when the users insert or update the invoice it is ok for all item but only fiew item when he try to insert it and save the system stop on all pcs

when i start to debug my system to check one of this items which have problem i found this error

Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

the code which have error on this items only

try
If dtDS.HasChanges = True Then

                dbCmdB.DataAdapter = dtAdp
                dtAdp.Update(dtDt)

            End If
Catch ex As Exception
MsgBox(ex.Message)
End Try

and i used

dtAdp.SelectCommand.CommandTimeout = 0

to remove the error and i Succeed but i didn't get any Response and i must restart my application to end the debug

Answer 1

i get the reason If You make a very huge database do not use the * in any SQL statement Like Select or Delete or any thing