Mobile Banking Application in ASP.NET using VB

In this article I will explain you about Mobile Banking Application in ASP.NET using VB.NET
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We want to develop an application for a bank that will provide its users with their account balance on a mobile device. Users will be authenticated against their pre assigned credentials and, if that is successful, logged on. Then they will be asked for their account number, which returns their balance.

For this example, XML is used as a data source. We will interact with the XML file, which has been extracted from a database and opened with the specific field to be read only.

Let's have a look at the XML file (shown in Listing 24.8).

Listing 24.8: XML Bank Data File


<
BankData>
          <
customer>
                   <
Name>Shivani</Name>
                   <
Password>hishivani</Password>
                   <
AccountNo>117971</AccountNo>
                   <
Balance>5000</Balance>
          </
customer>
          <
customer>
                   <
Name>Shilpa</Name>
                   <
Password>hishilpa</Password>
                   <
AccountNo>117972</AccountNo>
                   <
Balance>7000</Balance>
          </
customer>
          <
customer>
                   <
Name>Neha</Name>
                   <
Password>hineha</Password>
                   <
AccountNo>117973</AccountNo>
                   <
Balance>9000</Balance>
          </
customer>
          <
customer>
                   <
Name>Shubham</Name>
                   <
Password>hishubham</Password>
                   <
AccountNo>117974</AccountNo>
                   <
Balance>11000</Balance>
          </
customer>
</
BankData>

Our requirement, once again, is to allow the customer to view her account balance, once she has been authenticated. The code in Listing 24.9 accomplishes this goal.

Listing 24.9: Mobile Banking 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" %>
<%@ Import Namespace="System.Xml" %>
<script runat="server" language="vb">
   
Private flag1 As Integer, flag2 As Integer
Private Balance1 As String
 
Public
Sub SubmitBtn_Click(ByVal sender As [Object], ByVal e As EventArgs)
    Dim _doc As New XmlDocument()
    _doc.Load("E:/ASPXSITE/Examples/casestudyxml.xml")
    Dim _snames As XmlNodeList = _doc.GetElementsByTagName("Name")
    Dim _spasswords As XmlNodeList = _doc.GetElementsByTagName("Password")
 
    For _i As Integer = 0 To _snames.Count - 1
        If _snames(_i).InnerText = Name.Text AndAlso _spasswords(_i).InnerText = Password.Text
    Then
            flag1 = 1
            Exit For
        Else
            flag1 = 0
        End If

    Next 
    If flag1 = 1 Then
        ActiveForm = Form2
    Else
        ActiveForm = Form3
    End If
End Sub
 
Public
Sub SecondForm_OnActivate(ByVal sender As [Object], ByVal e As EventArgs)
    Welcome.Text = "u r successfully logged on"
End Sub
 
Public
Sub AccNo_Submit(ByVal sender As [Object], ByVal e As EventArgs)
    Dim _doc As New XmlDocument()
    _doc.Load("E:/ASPXSITE/Examples/casestudyxml.xml")
    Dim _snames As XmlNodeList = _doc.GetElementsByTagName("Name")
    Dim _spasswords As XmlNodeList = _doc.GetElementsByTagName("Password")
    Dim _sbalance As XmlNodeList = _doc.GetElementsByTagName("Balance")
    Dim _saccno As XmlNodeList = _doc.GetElementsByTagName("AccountNo")
 
    For _i As Integer = 0 To _snames.Count - 1
        If _saccno(_i).InnerText = AccountNo.Text AndAlso _snames(_i).InnerText = Name.Text
    AndAlso _spasswords(_i).InnerText = Password.Text Then
            flag2 = 1

            Balance1 = _sbalance(_i).InnerText
            Exit For
        Else
            flag2 = 0
        End If
    Next
 
    If flag2 = 1 Then
        Balance.Text = "u r balance is $ " & Balance1
        Conclusion.Text = "Thank You"

        ActiveForm = Form4
    Else
        Balance.Text = "Invalid Account No"
        Conclusion.Text = "You need to Relogin"
        ActiveForm = Form4
    End If
End Sub

</
script>

<
mobile:form runat="server" id="Form1" backcolor="#336699" forecolor="#ffffff">
<
mobile:Label runat="server" Font-Name="Arial">Name</mobile:Label>
<
mobile:TextBox runat="server" id="Name" ForeColor="#000000" />
<
mobile:Label runat="server" Font-Name="Arial">
Password

</
mobile:Label>
<
mobile:TextBox runat="server" id="Password" ForeColor="#000000" />
<
mobile:Command runat="server"
OnClick
="SubmitBtn_Click" Text="Go!"/>
</
mobile:form>
<
mobile:form runat="server" id="Form2" onactivate="SecondForm_OnActivate" font-name="Arial">
<
mobile:Label runat="server" id="Welcome" />
<
mobile:Label runat="server" id="Label2" Text="Enter Account No."/>
<
mobile:TextBox runat="server" id="AccountNo"
ForeColor
="#000000" />
<
mobile:Command runat="server" OnClick="AccNo_Submit" Text="Go!" />
<
mobile:Link runat="server"
Font-Size
="Small" NavigateURL="#Form1"
Text
="Return to Start"/>
</
mobile:form>
<
mobile:form runat="server" id="Form3" onactivate="SecondForm_OnActivate" font-name="Arial">
<
mobile:Label runat="server" id="Label3" Text="Login Failed" />
<
mobile:Link runat="server" Font-Size="Small"
NavigateURL
="#Form1" Text="Return to Start"/>
</
mobile:form>
<
mobile:form runat="server" id="Form4" font-name="Arial">
<
mobile:Label runat="server" id="Balance"/>
<
mobile:Label runat="server" id="Conclusion"/>
<
mobile:Link runat="server"
Font-Size
="Small"
NavigateURL
="#Form1" Text="Return to Start"/>
</
mobile:form>

The code is self-explanatory, but it requires a basic knowledge of using XML with .NET.

The output is shown in Figures 24.16 through 24.18. This is the output as long as the input is correct. This way we can develop basic mobile applications for different domain clients.

Figure 24.16: Authentication Screen Prompting for Name and Password

Figure-24.16.gif

Figure 24.17: Screen Prompting for Account Number After Successful Log-on

Figure-24.17.gif

Figure 24.18: Final Screen, Showing the Balance

Figure-24.18.gif

Let's see one more example, which will give you a fair idea of how rich the functionality of ASP.NET classes can be when deployed for mobile controls.

Conclusion

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

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