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http://stackoverflow.com/questions/1050222/concurrency-vs-parallelism-what-is-the-difference Concurrency is when two or more tasks can start, run, and 阅读全文
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https://en.wikipedia.org/wiki/Keepalive Description A keepalive signal is often sent at predefined intervals, and plays an important role on the Inter 阅读全文
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https://msdn.microsoft.com/en-us/library/windows/desktop/ms633497(v=vs.85).aspx Enumerates all top-level windows on the screen by passing the handle t 阅读全文
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https://msdn.microsoft.com/en-us/library/dd321424(v=vs.110).aspx Represents an asynchronous operation that can return a value. Type Parameters The typ 阅读全文
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https://msdn.microsoft.com/en-us/library/system.threading.tasks.task(v=vs.110).aspx The Task class represents a single operation that does not return 阅读全文
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Clears the DataSet of any data by removing all rows in all tables. 需要注意的是这个方法不会清空DataSet中的DataTable,仅仅是把所有DataTable中的DataRow给清除了 DataTable仍然会被保留 如果要连带 阅读全文