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<%@ Page Language="VB" %>
<script runat="server">
Sub Page_Load(ByVal source As Object, ByVal e As EventArgs)
If Not IsPostBack() Then
'Redirect to same page is not a post back
'Default value if data is not in query string
Dim DataString As String = "!!No data passed!!"
If Request.QueryString("Data") IsNot Nothing Then
Try
'Decode the query string data
DataString = DanielHac.TamperProofString.QueryStringDecode(Request.QueryString("Data"))
Catch ex As Exception
'Data was tampered with.
DataString = "!!Data was corrupt!!"
End Try
End If
'Show data on web page
ShowData.Text = DataString
End If
End Sub
Sub Submit_Click(source as object, e as eventargs)
'Redirect to this page with the data from InputData
Response.Redirect("TamperProofQueryString.aspx?Data=" & DanielHac.TamperProofString.QueryStringEncode(InputData.Text))
End Sub
</script>
<html>
<head>
</head>
<body>
<form runat="server">
<b>Data received from query string:</b>
<br />
<asp:TextBox id="ShowData" runat="server" ReadOnly="True" TextMode="MultiLine" Rows="2" Columns="80"></asp:TextBox>
<br />
<br />
<b>Enter data to be transmitted by query string:</b>
<br />
<asp:TextBox id="InputData" runat="server" Text="Test Data"></asp:TextBox>
<asp:Button id="Submit" onclick="Submit_Click" runat="server" Text="Submit"></asp:Button>
<br />
<br />
<!-- how to use as hyperlink -->
<a href='TamperProofQueryString.aspx?Data=<%=DanielHac.TamperProofString.QueryStringEncode("This data was stored in the hyperlink.")%>'>HyperLink With Predefined Data</a>
</form>
</body>
</html>
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