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我想绘制一个验证码，以及一个文本框，用户将在其中放置验证码的值，并且在提交到服务器之前必须验证文本框的值，即客户端验证。如果 tebox 值与验证码值不匹配然后它会在重定向到 server.In ASP.NET 之前显示错误消息