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    <p>1 ) The TestDelegate already pointing to a Method ( "PrintOut").Why do Again we are passing another method ("callback") in d.BeginInvoke("Hello",new AysncCallback(Callback),d);.Does it mean d.BeginInvoke executes "PrintOut" and "Callback" parallely?.Can you please explain line by line what exactly going on?</p> <ul> <li>PrintOut and Callback are not executed in paralled. Callback will be called when PrintOut has finished and returned.</li> </ul> <p>2) Normally, Aysnchronous execution means the execution of a "thread" is not predictable or fastest execution ?</p> <ul> <li>No. Asynchronous execution means the execution is not synchronous. That is.. the timing and execution time of the execution are not related to the timing of the piece of code that starts the asynchronous operation. It is the opposite of synchronous execution. With synchronous operation you would expect the execution to complete before the next statement is executed. For example, calling another method directly is synchronous operation, or another example is calling a function on a remote service and waiting for it to return before continuing.</li> </ul> <p>3) TestDelegate d = (TestDelegate)ar.AsyncState; "TestDelegate" d is a delegate.How is it possible to cast it to filed or property? ( ar.AsyncState )</p> <ul> <li>The delegate is not being case to a field or property. The cast is the other way around. The field or property is being cast into a TestDelegate.</li> </ul> <p>4) can you provide me some live example where do i need to use this Asynchronous execution?</p> <ul> <li>An example might be if you have a user interface that displays reports. The report might need to be generated from data in a database and takes a long time to generate. You would want to generate the report asynchronously so that the user interface can carry on running. If the report was not generated asynchronously the user interface might appear to be frozen and the user might think the program has crashed.</li> </ul>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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