Mobile Mail sending Application in ASP.NET using VB

This program will allow the user to send mail from his mobile device. Here we use a mail server and make use of the classes provided in the System.Web.Mail namespace. We also make elaborate use of validation controls.

Listing 24.10: Mail Sending Application

<%@ Page Inherits="System.Web.UI.MobileControls.MobilePage" Language="vb" %>
<%@ Register TagPrefix="mobile" Namespace="System.Web.UI.MobileControls" Assembly="System.Web.Mobile" %>
<%@ Import Namespace="System.Web.Mail" %>
<script language="vb" runat="server">
   
Protected Sub Submit_OnClick(ByVal sender As [Object], ByVal e As EventArgs)
    If Page.IsValid Then
        ''' Make an object of MailMessage Class
        Dim message As New MailMessage()
 
        '''Set the Fields
        message.[To] = [to].Text
        message.From = from.Text
        message.Subject = subject.Text
 
        '''Set u r Mail Server here
        SmtpMail.SmtpServer = "c-sharpcorner.com"
 
        ''' This will send the Message
        SmtpMail.Send(message)
 
        ''' Give the Confirmation as the Message has been sent
        confirm.Text = "Mail has been sent to " + [to].Text 
        'Activate Second Form
        Me.ActiveForm = Form2
    End If
End Sub

</script>

Listing 24.10 is the final action in the example. When the user submits the form, the Submit_OnClick method is called, and once the message is e-mailed, Form2 is activated. But first we have to get input from the user for both the To and From fields. We will limit the data we collect, as it is difficult to type on a phone (see Listing 24.11).

Listing 24.11: Mail Sending: User Interface

<mobile:form id="Form1" runat="server">
<mobile:Label runat="server">
FROM :
</mobile:Label>
<mobile:TextBox id="from" runat="server"/>
<mobile:RequiredFieldValidator
id="FromValidator1"
ControlToValidate="from" runat="server">
Enter from address
</mobile:ReuiredFieldValidator>
<mobile:RegularExpressionValidator
id="FromValidator2"
ControlToValidate="from"
ValidationExpression="\w+([-+.]\w+)*@\w+([-.]\w+)
*\.\w+([-.]\w+)*"
runat="server">
Enter a valid Email Id
</mobile:RegularExpressionValidator>
<mobile:Label runat="server">
TO:
</mobile:Label>
<mobile:TextBox id="to" runat="server"/>
<mobile:RequiredFieldValidator
id="toValidator1"
ControlToValidate="to" runat="server">
Enter to address
</mobile:RequiredFieldValidator>
<mobile:RegularExpressionValidator
ControlToValidate="to"
ValidationExpression="\w+([-+.]\w+)*@\w+
([-.]\w+)*\.\w+([-.]\w+)*"
runat="server">
Enter a valid Email Id
</mobile:RegularExpressionValidator>
<mobile:Label runat="server">
MESSAGE:
</mobile:Label>
<mobile:TextBox id="subject" runat="server"/>
<mobile:Command runat="server" OnClick="Submit_OnClick">
Submit
</mobile:Command>
</mobile:form>
<mobile:form id="Form2" runat="server">
<mobile:Label id ="confirm" runat="server">
</mobile:Label>
</mobile:form>

The validators will allow the Submit function to be called only after the page has been validated. Do not forget the IsValid property, as was mentioned earlier.

The output shown in Figure 24.19 should appear on the phone screen.

Figure 24.19: Input Screen for From and To E-Mail Address and Message



If all the fields are valid and you are pointing to a valid SMTP server, then your output should appear as shown in Figure 24.20.

Figure 24.20: Confirmation Screen When User Clicks on Send Button



This is how easy it is to use the functionality of ASP.NET classes in your mobile controls.

Conclusion

Hope this article would have helped you in understanding Mobile Mail sending Application in ASP.NET using VB.