I am having an error while tring to send HTML mail. The error looks like below. The e-mails and password are fictitious. I use real ones in my asp.net application. The html that is contained in
htmlTextBox.Text property is:
<html><body>Test html e-mail</body></html>
protected void sendHTMLMail()
{
var smtpClient = new SmtpClient();
var message = new MailMessage();
smtpClient.Host = "smtp.live.com";
smtpClient.Port = 25;
message.From = new MailAddress("myhotmailmail@hotmail.com", "mypassword");
message.To.Add(new MailAddress("myyahoomail@yahoo.com.br"));
message.Subject = "HTML";
message.IsBodyHtml = true;
message.Body = htmlTextBox.Text;
smtpClient.Timeout = 15000;
smtpClient.EnableSsl = false;
smtpClient.Send(message);
}
The error a get when I run the code is below:
potentially dangerous Request.Form value was detected from the client (ctl00$MainContent$htmlTextBox="<html><body>Test htm...").
Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. To allow pages to override application request validation settings, set the requestValidationMode attribute in the httpRuntime configuration section to requestValidationMode="2.0". Example: <httpRuntime requestValidationMode="2.0" />. After setting this value, you can then disable request validation by setting validateRequest="false" in the Page directive or in the <pages> configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case. For more information, see http://go.microsoft.com/fwlink/?LinkId=153133.
Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (ctl00$MainContent$htmlTextBox="<html><body>Test htm...").
Source Error:
[No relevant source lines]
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Source File: c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\website3\a307838f\3c9d09e4\App_Web_trpg3bzd.2.cs Line: 0
Stack Trace:
[HttpRequestValidationException (0x80004005): A potentially dangerous Request.Form value was detected from the client (ctl00$MainContent$htmlTextBox="<html><body>Test htm...").]
System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) +8860756
System.Web.HttpRequest.ValidateNameValueCollection(NameValueCollection nvc, RequestValidationSource requestCollection) +122
System.Web.HttpRequest.get_Form() +150
System.Web.HttpRequest.get_HasForm() +9036751
System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +97
System.Web.UI.Page.DeterminePostBackMode() +69
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +8431
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +253
System.Web.UI.Page.ProcessRequest() +78
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
System.Web.UI.Page.ProcessRequest(HttpContext context) +49
ASP.default_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\website3\a307838f\3c9d09e4\App_Web_trpg3bzd.2.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +100
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
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