protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
    {
        string str = args.Value;
        try
        {
            int i = Convert.ToInt32(str);
            if (i % 2 != 0&i>0&i<100)
            {
                Button1.Text = "输入正确";
                CustomValidator1.IsValid = true;
            }
            else{
                CustomValidator1.ErrorMessage="不是奇数";
            }
        }
            catch{
                CustomValidator1.ErrorMessage="格式不对";
                CustomValidator1.IsValid = false;
            }
        }
验证文本框输入的为0-100的奇数：这里 CustomValidator1.ErrorMessage="不是奇数";                CustomValidator1.ErrorMessage="格式不对"; 错误信息看不见 是怎么回事？