pass xml variable into c# method in xslt - xslt

Question

i have xslt transform where im using c# code to save input and output xml to database.
but it saves only the values of all tags.
but i want to save vhole xml.
<msxsl:script language="CSharp" implements-prefix="ConnectDatabase">
<msxsl:assembly name = "System.Data"/>
<msxsl:using namespace = "System.Data"/>
<msxsl:using namespace = "System.Data.SqlClient"/>
<msxsl:using namespace = "System.Collections.Generic"/>
<![CDATA[
public void LogINOUT(string inputxml, string outputxml)
{
SqlCommand cmd = null;
string command = "INSERT INTO dbo.XsltLog (InputXml,OutputXml) VALUES (#inputxmlpar,#outputxmlpar)";
string connectionString ="Data Source=MyConneCtionStiring;
SqlParameter inputxmlpar = new SqlParameter("#inputxmlpar", SqlDbType.NVarChar);
inputxmlpar.Value=inputxml;
SqlParameter outputxmlpar = new SqlParameter("#outputxmlpar", SqlDbType.NVarChar);
outputxmlpar.Value =outputxml;
using (SqlConnection connection = new SqlConnection(connectionString))
{
cmd = new SqlCommand(String.Format(command), connection);
cmd.Parameters.Add(inputxmlpar);
cmd.Parameters.Add(outputxmlpar);
connection.Open();
cmd.ExecuteScalar();
}
}
]]></msxsl:script>
then a call it <xsl:copy-of select ="ConnectDatabase:LogINOUT( $inputxml,$outputxml)" />
and outputxml in database is something like this:
TO_TESTY45000.0000000020
from this string i know nothing
i wont its
<Data>
<Result>TO_TEST</Result>
<IncludeInVolume>Y</IncludeInVolume>
<FinancedAmont>
<xsl:value-of select="/Contract/ContractCalculations/Calculation/CalculationStep[#Code='FinancedAmount']"/>
</FinancedAmont>
<NumberOfInstalments>
<xsl:value-of select="format-number(/Contract/ContractCalculations/Calculation/CalculationStep[#Code='InstalmentNumber'],'#')"/>
</NumberOfInstalments>
</Data>
the same problem its with inputxml
thanks for Help Dana