XSLT Parameter to ASP.NET Variable

[wxdqz]

I'm trying to pass an XSLT parameter into an ASP.NET page, and back again, but it's not getting passed for some reason. If someone could let me know what I'm doing wrong, and possible help me out with a solution, it would be greatly appreciated. Thanks.

XML DOC:
<?xml version="1.0" encoding="ISO-8859-1"?>
<feedback>
<feedback id="1">
<fname>FIRSTNAME</fname>
<lname>LASTNAME</lname>
</feedback>
</feedback>

XSLT DOC:
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xslutput method="xml" encoding="UTF-8" indent="yes"/>
<!-- PAGE-SPECIFIC PARAMETERS -->
<xslaram name="fname_val" select="''" />
<xslaram name="lname_val" select="''" />
<!-- FORM VALIDATION VARIABLES -->
<xsl:variable name="fname_msg">Must enter between 1 and 30 characters</xsl:variable>
<xsl:variable name="lname_msg">Must enter between 1 and 30 characters</xsl:variable>
<xsl:template match="/">
<form method="post" action="feedback.aspx">
<table class="navyblueborder" width="100%">
<xsl:for-each select="feedback/feedback">
<tr>
<td class="whiteheader" bgcolor="#333366" colspan="2">Feedback Form</td>
</tr>
<tr>
<td bgcolor="#ccccff"><strong>First Name:</strong></td>
<td bgcolor="#ccccff"><input type="text" id="txtfname" name="txtfname" value=http://www.webdeveloper.com/forum/archive/index.php/"fname_test" size="30" maxlength="30" tabindex="1" />
<font color="red">*
<xsl:if test="$fname_val !=''">
<xsl:value-of select="$fname_msg" />
</xsl:if>
</font>
</td>
</tr>
<tr>
<td bgcolor="#ccccff"><strong>Last Name:</strong></td>
<td bgcolor="#ccccff"><input type="text" id="txtlname" name="txtlname" value=http://www.webdeveloper.com/forum/archive/index.php/"lname_test" size="30" maxlength="30" tabindex="2" />
<font color="red">*</font></td>
</tr>
</xsl:for-each>
</table>
</form>
</xsl:template>
</xsl:stylesheet>

ASP.NET DOC (feedback.aspx):
<%@ Page Language="VB" ContentType="text/html" ResponseEncoding="iso-8859-1" Debug="true" %>
<%'Declare XML and XSL file paths
Dim xmlURL As String, xslURL As String
xmlURL = "feedback.xml"
xslURL = "feedback.xsl"

'Load XML
Dim xml = Server.CreateObject("MSXML2.DOMDocument.3.0")
xml.async = false
xml.load(xmlURL)

'Load XSL
Dim xsl = Server.CreateObject("MSXML2.DOMDocument.3.0")
xsl.async = false
xsl.load(xslURL)

'Pull in form data
Dim fname_form As String = trim(Request.Form("txtfname")) 'REQUIRED
Dim lname_form As String = trim(Request.Form("txtlname")) 'REQUIRED

'Test pulled in form data
Response.Write("Form FName: " + fname_form + "<br />") 'TEST
Response.Write("Form LName: " + lname_form + "<br />") 'TEST

'Pull in XSL parameters
Dim fname_param = xsl.selectSingleNode("//xslaram[@name='fname_val']")
fname_param.SetAttribute("select", "'" & fname_form & "'")
Response.Write("XML FName: " + fname_param + "<br />") 'TEST

Dim lname_param As String = xsl.selectSingleNode("//xslaram[@name='lname_val']")
fname_param.SetAttribute("select", "'" & lname_form & "'")
Response.Write("XML LName: " + lname_qs + "<br />") 'TEST
%>

RESULTING ERROR:
Exception Details: System.NullReferenceException: Object variable or With block variable not set.

Source Error:

Line 49: Dim fname_param = xsl.selectSingleNode("//xslaram[@name='fname_val']")
Line 50: fname_param.SetAttribute("select", "'" & fname_form & "'") '<!---***ERROR IS ON THIS LINE***
Line 51: Response.Write("XML FName: " + fname_param + "<br />") 'TEST
Line 52: