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<p>Converts virtual key to ASCII. </p>
<p >This method converts the specified virtual key to ASCII, if possible.<br  />
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For example VK_A is converted to 'A' (ASCII 0x41), CTRL + VK_SPACE produces ASCII NUL (0x00), CTRL + letter produces ASCII control codes from SOH (0x01) to SUB (0x1A), CTRL + VK_BACKSLASH produces ASCII FS (0x1C), CTRL + VK_QUESTION produces ASCII US (0x1F), CTRL + VK_LEFTBRACKET produces ASCII ESC (0x1B), CTRL + VK_RIGHTBRACKET produces ASCII GS (0x1D), CTRL + VK_TILDE 