如果要是CAPTCHA文本是正确的（Page.IsValid）//将是真实的，否则这将是错误的
{
 // ***您code ****}
 

编辑：
呼叫
Page.Validate（）检查条件之前

I am using Google recaptcha in one of our projects. I added the recaptcha control in aspx page. Now i want to validate the value entered in recaptcha that is whether it is correct or not. How can i done it in a button click event? I am using c#.

if(Page.IsValid) //Will be true if captcha text is correct otherwise it will be false
{
 //***your code****

}

Edit: call Page.Validate() before checking condition