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How to encrypt multiple query string values passing from gridview in asp.net?

The following syntax to encrypt single query string value passing from gridview in asp.net is working properly

<asp:HyperLink ID="HyperLink1" NavigateURL='<%# "billingitemsentrylab.aspx?pid=" + HttpUtility.UrlEncode(EncDecMK.Encrypt(Eval("pid").ToString())) %>' Text='<%# Eval("pname") %>' runat= "server">
</asp:HyperLink>

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However the following syntax to encrypt multiple query string values from gridview is not working.

<asp:HyperLink ID="HyperLink1" NavigateURL='<%# "adminpatientlabinfo.aspx?pid=" + HttpUtility.UrlEncode(EncDecMK.Encrypt(Eval("pid").ToString()))+ "&rnumber=" HttpUtility.UrlEncode(EncDecMK.Encrypt(Eval("rnumber").ToString())) + "&financialyear=" HttpUtility.UrlEncode(EncDecMK.Encrypt(Eval("financialyear").ToString()))  %>' Text='<%# Eval("pname") %>' runat= "server">
</asp:HyperLink>

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All parameter values i.e. pid, rnumber and financial year are integers

Can anyone correct the syntax

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Robert Schutt

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Srinivas Mantha

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Alternatively, one can use the following syntax which also works
<asp:TemplateField>
<ItemTemplate>
<asp:HyperLink ID="HyperLink2" runat="server" NavigateUrl='<%# string.Format("adminpatientlabinfo.aspx?pid={0}&rnumber={1}&financialyear={2}",
HttpUtility.UrlEncode(EncDecMK.Encrypt(Eval("pid").ToString())), HttpUtility.UrlEncode(EncDecMK.Encrypt(Eval("rnumber").ToString())), HttpUtility.UrlEncode(EncDecMK.Encrypt(Eval("financialyear").ToString()))) %>'
Text='<%# Eval("pname") %>'/>
</ItemTemplate>
</asp:TemplateField>

Please see the following link:

http://www.aspsnippets.com/Articles/How-to-bind-and-pass-query-string-in-HyperLink-in-GridView-in-ASPNet.aspx
The above reference uses encryption and decryption code on every page. Instead, in my project i have written the code in separate C# class file and used it where necessary
For example, on aspx page where the gridview is located, I used
<%@ Import Namespace="EncryptDecryptMK" %>
And in the destination (target), aspx.cs code file I used
using EncryptDecryptMK;

lblpid.Text = EncDecMK.Decrypt(HttpUtility.UrlDecode(Request.QueryString["pid"].ToString()));
lblrnumber.Text = EncDecMK.Decrypt(HttpUtility.UrlDecode(Request.QueryString["rnumber"].ToString()));

lblfyear.Text = EncDecMK.Decrypt(HttpUtility.UrlDecode(Request.QueryString["financialyear"].ToString()));