Smtp Email sending problem

This code works fine in my local PC:
public static void SendMailMessage(string subject, string body)
{
MailMessage mMailMessage = new MailMessage();

// Set the sender address of the mail message
mMailMessage.From = new MailAddress("[email protected]");
// Set the recepient address of the mail message
mMailMessage.To.Add(new MailAddress("[email protected]"));

mMailMessage.Subject = subject;
// Set the body of the mail message
mMailMessage.Body = body;
// Set the format of the mail message body as HTML
mMailMessage.IsBodyHtml = true;
// Set the priority of the mail message to normal
mMailMessage.Priority = MailPriority.Normal;


// Instantiate a new instance of SmtpClient
SmtpClient mSmtpClient = new SmtpClient();
mSmtpClient.Port = 587;
mSmtpClient.Host = "mail.sgmedicaltour.com";

System.Net.NetworkCredential autheninfo = new System.Net.NetworkCredential("postmaster", "mypassword");

mSmtpClient.Credentials = autheninfo;
//mSmtpClient.UseDefaultCredentials = false;
mSmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;

// Send the mail message
mSmtpClient.Send(mMailMessage);
}






the error message is:

Server Error in '/' Application.
--------------------------------------------------------------------------------

Security Exception
Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Net.Mail.SmtpPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

Source Error:


[No relevant source lines]


Source File: App_Web_saubipte.0.cs Line: 0

Stack Trace:


[SecurityException: Request for the permission of type 'System.Net.Mail.SmtpPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]
System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) +0
System.Security.CodeAccessPermission.Demand() +61
System.Net.Mail.SmtpClient.set_Port(Int32 value) +106
MedicalTouren.Utility.MailHelper.SendMailMessage(String from, String to, String subject, String body) in MailHelper.cs:35
MedicalTouren.MediEnquiryEn.btnSubmit_Click(Object sender, EventArgs e) in MediEnquiryEn.aspx.cs:33
System.EventHandler.Invoke(Object sender, EventArgs e) +0
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6785
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +242
System.Web.UI.Page.ProcessRequest() +80
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
System.Web.UI.Page.ProcessRequest(HttpContext context) +49
ASP.medienquiryen_aspx.ProcessRequest(HttpContext context) in App_Web_saubipte.0.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

 

The code works fine in local pc, but after I deployed, it prompt these error

 

You'll need to increase the trust level on your application to either High or Full. By default it is set to Medium. Try looking at this kb article.

http://support.Winhost.com/KB/a657/changing-the-default-aspnet-trust-level.aspx