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I n addit ion t o Windows Form s, t heir cont rols, and t he out com e of com put at ions, t im ers r epr esent anot her t ypical source for event s. The .NET Fram ew or k offers t wo t ypes of t im ers Windows t im ers and Serv er t im ers. Windows t im er s t arget applicat ions inside Windows Form s. You can add t hem t o y our form s eit her fr om t he Windows Form s cont rol sect ion of t he Toolbox in t he Windows Form s Designer or program m at ically . I nst ant iat e t im er inst ances from t he Syst em .Windows.Form s nam espace. Microsoft init ially int r oduced Windows t im ers w it h Visual Basic 1.0. Alt hough Serv er t im ers can r un in Windows For m s, t hey t arget t asks t hat don t requir e a v isual int erface. Nevert heless, Visual St udio .NET let s you add Ser ver t im ers t o form s from t he Com ponent s sect ion of t he Toolbox . You can also add Ser ver t im ers pr ogram m at ically . I nst ant iat e Serv er t im ers from t he Syst em .Tim ers nam espace. When y our applicat ions requir e a robust t im er, you should consider a Ser ver t im er, w hich is m ore accurat e t han a Windows t im er. You can specify t he int er val of a Serv er t im er bet w een elapsed t im e ev ent s down t o t he level of m illiseconds. The Windows t im er is lim it ed t o a m inim um int er val of 55 m illiseconds. I n addit ion, a Windows t im er r uns on a single t hr ead wit hin a Windows for m . A
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Ser ver t im er is designed t o w or k w it h m ult iple t hr eads not j ust one like t he Windows t im er . Ther efore, Serv er t im ers ar e less lik ely t o degrade t he accuracy of t heir t im ing behav ior as t he load on a com put er becom es heav y from dat abase access, int ensiv e calculat ions, or ot her t asks t hat can heav ily consum e com put er resources. When y ou drag a Serv er t im er t o a Windows form , t he t im er appears in t he Com ponent t ray below t he form . All nonv isual com ponent s appear in t his t ray . Figur e 9- 13 shows a Windows Form s Designer for t he Ev ent sSam ple solut ion j ust aft er I dragged a Serv er t im er fr om t he Toolbox t o Form 6. The Propert ies window shows t he default set t ings for t he Serv er t im er com ponent . To use t he t im er, you m ust set it s I nt erval propert y t o a value in m illiseconds and it s Enabled propert y t o True. For exam ple, t o set a 3- second int er val for a t im er, set it s I nt er val propert y t o 3000. The Ser ver t im er raises an Elapsed ev ent at t he end of ev er y int erval. Wit hout any int er vent ion, t he Serv er t im er runs cont inuously aft er y ou init ialize it by set t ing it s Enabled pr opert y t o Tr ue. You can st op and r est art t he t im er wit h t he St op and St art m et hods. To perform act ions associat ed wit h t he Elapsed ev ent s, y our applicat ion m ust hav e an Elapsed event handler for t he t im er com ponent .
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