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我目前正在开发一个应用程序，该应用程序将使用户能够从我们在他的电子邮件地址中提供的链接下载演示软件。 24 小时后，现在我已经通过他的电子邮件地址中显示的链接完成了，他可以下载但是在禁用此链接的编码中..我收到错误我的代码是..
protected void btn_sub_Click(object sender, EventArgs e)
{
cn.Open();
objInquiry.Name = txt_name.Text.ToString().Trim();
objInquiry.MobileNo = txtMobileNo.Text.ToString().Trim();
objInquiry.EmailId = txt_eid.Text.ToString().Trim();
objInquiry.InquiryFor = "Agriculture Product Marketing comity System".ToString().Trim();
objInquiry.Message = txt_msg.Text.ToString().Trim();
using (DataSet ds = objInquiry.InsertInquiry())
{
Msg.Visible = true;
Msg.Text = "Thank U For Inquiry We Will Send Demo Link To Your Email Please Check Your Email Regularly";
}
try
{
DateTime dt1 = Convert.ToDateTime(Request.QueryString["period"].ToString());
DateTime dt2 = DateTime.Now;
TimeSpan ts = dt2 - dt1;
if (ts.TotalMinutes > 5)
{
Response.Write("Download time is over");
}
else
{
MailMessage mail = new MailMessage();
mail.From = new MailAddress("abc@gmail.com");
mail.To.Add(txt_eid.Text);
mail.Subject = txtInquiryFor.Text;
mail.IsBodyHtml = true;
mail.Body = "Welcome Mr." + txt_name.Text + "<br><br>";
mail.Body += "To ShreeHans Webnology" + "<br><br>";
mail.Body += "Thank u for putting inquiry for" + txtInquiryFor.Text + "<br><br>";
mail.Body += "Please Click on Following Link To Download Your Demo" + "<br><br>";
mail.Body += "<a href=\"http://www.test.co.in/ConatctUs.aspx?period=" + DateTime.Now + "'\">Download Demo Software</a>";
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.Port = 587;
smtp.EnableSsl = true;
smtp.Credentials = new System.Net.NetworkCredential("abc@gmail.com", "*****");
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Send(mail);
}
}
catch (Exception ex)
{
ex.ToString();
}