validation - How to allow CaptchaControl not a case sensitive in asp.net(both capital and small character should allow)) -

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captchacontrol code 

 <captcha:captchacontrol id="captcha1" runat="server" captchabackgroundnoise="low"                                             captchalength="5" captchaheight="60" captchawidth="200" captchalinenoise="none"                                             captchamintimeout="5" captchamaxtimeout="240" fontcolor="#529e00" />

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