Tooltip information at DoDragDrop() in C# winforms

while writing DoDragDrop(), a tooltip message informing that

(The documentation is still being constructed. Please try again in a few se开发者_C百科conds.)

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What did it means?

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It means that the documentation cache (the cache that is accessed to display tooltip information about members) is still being constructed. If you try again after a few seconds, you should be able to see the documentation for the method.