Firma non valida del metodo Begin asincrono per il metodo <var>Method name</var> in ServiceContract di tipo <var>Type Name</var>. Il metodo Begin deve accettare un AsyncCallback e un oggetto come ultimi due argomenti e restituire un IAsyncResult.

Invalid async Begin method signature for method <var>Method name</var> in ServiceContract type <var>Type Name</var>. Your begin method must take an AsyncCallback and an object as the last two arguments and return an IAsyncResult.

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