how to send an xml dataset to a Stored Procedure in mssql

I've been trying to do this manually...I'm wondering how to do this (if it
can be done) in Visual Studio
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I have an xml file that I read into a dataset.
and I'm trying to use a stored procedure (see SPROC #1 below)
that inserts this xml dataset into an sql table via OpenXML.
Nothing gets inserted into the sql table except nulls,
so I think that perhaps I'm not actually sending the (xml)
dataset to the SPROC.

The code below fails on this line:    sqlCommand1.ExecuteNonQuery();

(The SPROC works fine when I run it in Query Analyzer
and SET the xml file directly as a string. See the SPROC #2 below)

What do I need to do to send the xml datset to the SPROC?

Thank you.

Paul

============           C#        ===============

            DataSet dsInsiderOwners = new DataSet("ownershipDocument");
            string filePath = "D:\\SEC\\Programming\\SEC DataBots\\SEC DataBot Test
Files\\Form 4\\From QS.xml";

            dsInsiderOwners.ReadXml(filePath);

            string myConnectionString = "workstation id=AMD;packet
size=4096;integrated security=SSPI;data source=AMD;persist security
info=False;initial catalog=MyDatabase";
            SqlConnection sqlConnection1 = new SqlConnection(myConnectionString);

            SqlCommand sqlCommand1 = new SqlCommand();
            sqlCommand1.Connection = sqlConnection1;
            sqlCommand1.CommandType = System.Data.CommandType.StoredProcedure;
            sqlCommand1.CommandText = "_sp_Insert_Form_004_XML_template_07";
            sqlCommand1.Parameters.Add(new
System.Data.SqlClient.SqlParameter("@Form_004", System.Data.SqlDbType.NText));
            sqlCommand1.Parameters[0].Value = dsInsiderOwners;

            sqlConnection1.Open();
            sqlCommand1.ExecuteNonQuery();
            sqlCommand1.Connection.Close();

============    SPROC #1 - accepts xml as a variable        ==================

CREATE PROC   _sp_Insert_Form_004_XML_template_07   (@Form_004 nText)

AS

DECLARE @iDoc int--...........................................variable to
hold parsed xml stream

EXEC    sp_xml_preparedocument @iDoc OUTPUT,  @Form_004--.....create parsed xml
stream

SELECT * INTO Form_004_A--....................................To Insert Into
A NEWLY Created Table

FROM OPENXML(@iDoc, 'ownershipDocument/issuer',3)

WITH  (issuerCik char(10)  , issuerName char(40) , issuerTradingSymbol
char(10))

EXEC sp_xml_removedocument @iDoc

GO

============    SPROC #2 - for QueryAnalyzer  (xml set as a string)      
==================

DECLARE @iDoc int

DROP TABLE Form_004_A

DECLARE @XMLDoc varchar(8000)
SET @XMLDoc = '<?xml version="1.0"?>
<ownershipDocument>
   <schemaVersion>X0202</schemaVersion>
   <documentType>4</documentType>
   <periodOfReport>2005-04-29</periodOfReport>
   <notSubjectToSection16>0</notSubjectToSection16>
   <issuer>
       <issuerCik>0000796343</issuerCik>
       <issuerName>ADOBE SYSTEMS INC</issuerName>
       <issuerTradingSymbol>ADBE</issuerTradingSymbol>
   </issuer>
</ownershipDocument>'

EXEC    sp_xml_preparedocument @iDoc OUTPUT,  @XMLDoc

SELECT * INTO Form_004_A

FROM OPENXML(@iDoc, 'ownershipDocument/issuer',3)

WITH  (issuerCik char(10)  , issuerName char(40) , issuerTradingSymbol
char(10))

EXEC sp_xml_removedocument @iDoc

SELECT * FROM Form_004_A

GO