using (StringReader rdr = new StringReader(selectedLine.AdditionalInformation))
{
    XPathDocument doc = new XPathDocument(rdr);

    using (StringWriter writer = new StringWriter())
    {

        transformer.Transform(doc, null, writer);
        titleLabel.Attributes.Add("onmouseover", string.Format(@"showDiv(""{0}"")", writer.ToString()));
    }
}

The XSL/T loaded into the transformer variable is as follows

    

        
<table class='panelTable'></table>
        
        
<tr><td colspan='2' class='TitlePanelHeader'></td></tr>
        
        
<tr><td></td><td></td></tr>
        

And a sample xml string is as follows:

The result from the transformation is as follows:

Body Rides


Additional answer code


Additional answer date


Answer code


TOS


Answer date


Author
Richard Laymon


Delivery to
Company Name, Address Line 1, AddressLine 2


Expected delivery
09/08/2009


Held orders


Ordered on
20/07/2009


Print runs

The code to build up the xml within the object is below, note that the values are HtmlEncoded to ensure that there are no problems in the web page.

public string AdditionalInformation
{
    get
    {
        StringBuilder builder = new StringBuilder();
        builder.Append(string.Format(CultureInfo.CurrentCulture,
                                        @"",
                                        HttpUtility.HtmlEncode(this.Title)));
        AddLabelValue(builder, "Account number", ParentPurchaseOrder.AccountNumber);
        AddLabelValue(builder, "Additional answer code", this.AdditionalAnswerCode);
        AddLabelValue(builder, "Additional answer date",
            this.AdditionalAnswerDate.Year != 1 ? this.AdditionalAnswerDate.ToShortDateString() : "" );
        AddLabelValue(builder, "Answer code", this.AnswerCode);
        AddLabelValue(builder, "Answer date",
            this.AnswerDate.Year != 1 ? this.AnswerDate.ToShortDateString() : "");
        AddLabelValue(builder,"Author", this.Author);
        AddLabelValue(builder, "Delivery to",
            ParentPurchaseOrder.DeliveryName + ", " + ParentPurchaseOrder.Address1 + ", " +
                          ParentPurchaseOrder.Address2 + ", " +
                          ParentPurchaseOrder.Address3 + ", " +
                          ParentPurchaseOrder.Address4 + ", " +
                          ParentPurchaseOrder.Address5 + ", " +
                          ParentPurchaseOrder.Postcode);

        AddLabelValue(builder, "Expected delivery",
ParentPurchaseOrder.ExpectedDeliveryDate.ToShortDateString());
        AddLabelValue(builder, "Held orders", this.HeldOrders);
        AddLabelValue(builder, "Ordered on", ParentPurchaseOrder.OrderedOn.ToShortDateString());
        AddLabelValue(builder, "Print runs", this.PrintRuns);
                builder.Append("");

        return builder.ToString();

    }
}

private void AddLabelValue(StringBuilder builder, string label, string value)
{
      builder.Append(string.Format(CultureInfo.CurrentCulture,
                        @"",
                         label, HttpUtility.HtmlEncode(value)));
}