Insert WatiN ReCaptcha Value

I am using WatiN library and want to insert captcha value into ReCaptcha value field on uploaded.net file. But when I insert the value via:

ie.TextField(Find.ById("recaptcha_response_field")).Value = "myCaptcha";

      

        
        
        
      

    

The problem is when I paste it, the Upload button won't show. Only if I type something in the field, it is actually typing text. I've already tried:

ie.TextField(Find.ById("recaptcha_response_field")).KeyDown('a');

      

        
        
        
      

    

but I am getting an error.

Can you help me?