SendKeys Problem

I am trying to send keys to a webpage from a windows application. I send CTRL-A and CTRL-C for copying, but sometimes the textbox in webpage gets "C" or "A".

The code for copying is like this:

Code:

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Thread.Sleep(500);
SendKeys.SendWait("^(A)");
SendKeys.SendWait("^(C)");
Thread.Sleep(500);

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It happens not very often. But I want a safer way to send. Any idea?