V objektu InstanceHandle může najednou probíhat nejvýše jedna operace WaitForEvents nebo BeginWaitForEvents. Pokusili jste se spustit druhou operaci. Operaci WaitForEvents nebo BeginWaitForEvents volejte pouze po dokončení předchozí operace.
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English version
An InstanceHandle can have at most one outstanding WaitForEvents or BeginWaitForEvents operation in progress at a time. A second operation was attempted. Only call WaitForEvents / BeginWaitForEvents once the previous operation has completed.
.Net Framework