Waiting for an asynchronous response?

I am designing a multiclient/server software in c#. Right now, I am using it as asynchronous.

In some cases, I want client side to wait for the answe开发者_StackOverflow社区r.

For example, I need to send server a command to fetch me some info from the database and client program should continue according to the fetched data. How can i achieve this?

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You could wait on the IAsyncResult.WaitHandle, if this interface is being used in your scenario.