System.FormatException: La chaîne spécifiée est pas sous la forme requise pour une adresse e-mail

Question

net et xml im faire une forme envoyer un email tht mais il me donne une erreur

les adresses e-mail proviennent du fichier xml

The specified string is not in the form required for an e-mail address. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.FormatException: The specified string is not in the form required for an e-mail address. 

Source Error: 

Line 82:    client.Host = "mail.host" 
Line 83:    client.Port = 25 
Line 84:    client.Send("from", txtTo.Text, txtSubject.Text, txtMessage.Text) 
Line 85:    
Line 86:    lblMsg2.Text = "Email has been successfully sent" 

Stack Trace: 

[FormatException: The specified string is not in the form required for an e-mail address.] 
    System.Net.Mime.MailBnfHelper.ReadMailAddress(String data, Int32& offset, String& displayName) +934335 
    System.Net.Mail.MailAddress.ParseValue(String address) +245 
    System.Net.Mail.MailAddress..ctor(String address, String displayName, Encoding displayNameEncoding) +87 
    System.Net.Mail.Message..ctor(String from, String to) +127 
    System.Net.Mail.MailMessage..ctor(String from, String to) +117 
    System.Net.Mail.SmtpClient.Send(String from, String recipients, String subject, String body) +31 
    ASP.adminpanel_admincontact_aspx.btnSend_Click(Object s, EventArgs e) in C:\Users\Farnu\Desktop\xmlproject\adminpanel\AdminContact.aspx:84 
    System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105 
    System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107 
    System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7 
    System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11 
    System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 
    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746 

AdminContact.aspx

<%@ Page Language="VB" MasterPageFile="ContentMasterPage.master" Debug="true"%> 
<%@ Import Namespace="System.Data" %> 
<%@ Import Namespace="System.Xml" %> 
<%@ Import Namespace="System.Net.Mail" %> 

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> 
<script runat="server"> 
    Sub Page_Load() 
     If Not IsPostBack Then 
      BindEmailList() 
      pnlWriteEmail.Visible = False 
     End If 
     Dim Item As ListItem 

     If chkSelectAll.Checked Then 
      For Each Item In chklGuests.Items 
       Item.Selected = True 
      Next 
     End If 
    End Sub 

    Sub BindEmailList() 
     Dim dsGuestbookData As DataSet = New DataSet() 
     Dim xmlDataDoc As XmlDataDocument 
     Dim alGuest As ArrayList = New ArrayList() 

     dsGuestbookData.ReadXml(Server.MapPath("../App_Data/Contact.xml")) 
     xmlDataDoc = New XmlDataDocument(dsGuestbookData) 

     Dim xnlGuests As XmlNodeList 
     Dim xnGuest As XmlNode 

     Dim xnlGuests1 As XmlNodeList 
     Dim xnGuest1 As XmlNode 

     xnlGuests = xmlDataDoc.GetElementsByTagName("contactmessage") 
     xnlGuests1 = xmlDataDoc.GetElementsByTagName("contactmessage") 

     For Each xnGuest In xnlGuests 
      chklGuests.Items.Add(New ListItem(xnGuest.ChildNodes.Item(0).InnerXml)) 
      'lblGuests.Items.Add(New ListItem("<b>" & xnGuest.ChildNodes.Item(0).InnerXml & "</b><br/><b>" & "Msg:</b>" & xnGuest.ChildNodes.Item(1).InnerXml & "<br/><b>" & "Subject:</b>" & xnGuest.ChildNodes.Item(2).InnerXml & "<br/><br/>")) 


      'lblGuests.Items.Add(New ListItem("<b>" & xnGuest.ChildNodes.Item(0).InnerXml & "</b><br/><b>" & "Msg:</b>" & xnGuest.ChildNodes.Item(1).InnerXml & "<br/><b>" & "Subject:</b>" & xnGuest.ChildNodes.Item(2).InnerXml & "<br/><br/>")) 
     Next 
    End Sub 

    Sub btnNext_Click(ByVal s As Object, ByVal e As EventArgs) 
     Dim item As ListItem 
     Dim isSelected As Boolean = False 

     For Each item In chklGuests.Items 
      If item.Selected Then 
       isSelected = True 
       Exit For 
      End If 
     Next 
     If isSelected Then 
      lblMsg.Visible = False 
      pnlSelectEmail.Visible = False 
      pnlWriteEmail.Visible = True 

      Dim strTo As String = "" 

      For Each item In chklGuests.Items 
       If item.Selected Then 
        strTo &= item.Value & "," 
       End If 
      Next 

      strTo = Left(strTo, Len(strTo) - 1) 
      txtTo.Text = strTo 
     Else 
      lblMsg.Visible = True 
      lblMsg.Text = "Please select person(s)" 
     End If 
    End Sub 

    Sub btnSend_Click(ByVal s As Object, ByVal e As EventArgs) 
     If IsValid Then 
      Dim client As New SmtpClient() 
      client.Host = "mail.host" 
      client.Port = 25 
      client.Send(txtTo.Text, txtSubject.Text, txtMessage.Text, "Company Name") 

      lblMsg2.Text = "Email has been successfully sent" 
      pnlEmailForm.Visible = False 
     End If 
    End Sub 

</script> 

<html> 
<head><title>Contact</title></head> 
<div id="content"> 
    <div class="about"> 
<body> 
    <p>Contact messages</p> 
    <p>List of all the users that contacted us</p> 
    <p>Select user to send email, and then click the 'Next' button.</p> 
    <br /> 
    <%--<asp:HyperLink ID="hlAdmin" Text="Go back to admin home" NavigateUrl="admindefault.aspx" runat="server"/> 
    <br /><br />--%> 
    <asp:Label ID="lblMsg" runat="server" /> 

<%-- <form runat="server">--%> 
     <asp:Panel ID="pnlSelectEmail" runat="server"> 
      <asp:CheckBox ID="chkSelectAll" AutoPostBack="true" Text="Select All" runat="server" /> 
      <div style="margin-left:-3px;"> 
       <asp:CheckBoxList ID="chklGuests" runat="server" /> 
       <asp:CheckBoxList ID="lblGuests" runat="server" /> 
      </div> 
      <p> 
       <asp:Button ID="btnNext" type="Submit" OnClick="btnNext_Click" Text="Next" runat="server" /> 
      </p> 
     </asp:Panel> 

     <asp:Panel ID="pnlWriteEmail" runat="server"> 
     <br /> 
     <asp:HyperLink ID="hlSelectEmail" Text="Go back to select email list" NavigateUrl="AdminContact.aspx" runat="server" /> 
     <br /><br /><br /> 

     <asp:Label ID="lblMsg2" runat="server" /> 

     <asp:Panel ID="pnlEmailForm" runat="server"> 
      <table cellpadding="3px" cellspacing="0px" border="0px"> 
       <tr> 
        <td>To</td> 
        <td><asp:TextBox ID="txtTo" Text="" Columns="50" runat="server" /></td> 
       </tr> 
       <tr> 
        <td>Subject</td> 
        <td><asp:TextBox ID="txtSubject" Columns="50" runat="server" /></td> 
       </tr> 
       <tr> 
        <td>Message</td> 
        <td><asp:TextBox ID="txtMessage" TextMode="MultiLine" Columns="50" Rows="7" runat="server" /></td> 
       </tr> 
       <tr> 
        <td>&nbsp;&nbsp;</td> 
        <td> 
         <p> 
          <asp:Button ID="btnSend" type="submit" OnClick="btnSend_Click" Text="Send" runat="server" /> 
         </p> 
        </td> 
       </tr> 
      </table> 
     </asp:Panel> 

     </asp:Panel> 

<%-- </form> 
--%>  

</body> 

</html> 

    </div> 
     <img src="../App_Themes/theme/html/images/phone.jpg" alt="" width="953" height="87" /><br /> 
    </div> 
</asp:Content> 

contact.xml

<?xml version="1.0" encoding="utf-8"?> 
<contactmessages> 
    <contactmessage> 
    <useremail>username@yahoo.com</useremail> 
    <subject>hello</subject> 
    <message>Good Job!</message> 
    <date>4/13/2009 8:03:25 PM</date> 
    </contactmessage> 
<contactmessage> 
    <useremail>user@yahoo.com</useremail> 
    <subject>hello</subject> 
    <message>Good Job!</message> 
    <date>4/13/2009 8:03:25 PM</date> 
    </contactmessage> 
<contactmessages> 

Answer 1

Votre argument en faveur de l'adresse est pas une adresse e-mail valide.

client.Send("from", 

De devrait être une adresse email valide.

Answer 2

En Sub btnSend_Click (autour de la ligne 84):

client.Send("from", txtTo.Text, txtSubject.Text, txtMessage.Text) 

Le "from" devrait probablement une adresse e-mail bien formé.