Pump Messages During Long Operation

The CLR has been unable to transition from COM context 0x1b2938 to COM context 0x1b2aa8 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.i used smtpClient class to sending mails

I want to send some emails with 3 kb/s connection speed but after 60 the error will raised.

Can anyone offer a best and complet开发者_JAVA技巧e solution in C#?

It looks like you're using a COM component to send emails.

You should use .Net's SmtpClient class.