摘要：
To access the database, you need to provide connection parameters, such as the machine that the database is running on and possibly your login credentials. Anyone who has worked with ADO will be familiar with the .NET connection classes: OleDbConnection and SqlConnection. Below figure show two of th 阅读全文
摘要：
PollingOne technique is to poll and check if the delegate has already finished its work.The delegate class provides the methode BeginInvoke(), where you can pass the input parameters defined with the delegate type. BeginInvoke() always has two additional parameters of type AsyncCallBack and object, 阅读全文