XML & .net

I have super simple xml and below .net c# codes and just try to read

stepID=1 and controlID=state and it should return two states under <Data></Data> but it does not happen. not sure why and need experts helping.

Thanks

  public string GetOptionList(string stepID, string controlID)
        {
            string tmpStr = string.Empty;
            XmlDocument myXml = new XmlDocument();
            myXml.Load(Server.MapPath("~") + "\\testStructure.xml");
            XmlNodeList oXmlNodeList = myXml.SelectNodes("Structure/Step[@ID=" + stepID + "]/Section/Control[ID=" + controlID + "]/Data");
            foreach (XmlNode x in oXmlNodeList)
            {
                string option = x.SelectSingleNode("Option").InnerText;
                tmpStr = tmpStr + "<option>" + option + "</option>";
            }
            return tmpStr;
        }

<?xml version="1.0" encoding="utf-8" ?>
<Structure>
    <Step ID="1">
      <Section>
        <Control>
          <Label>First Name</Label>
          <ID>firstName</ID>
          <Type>Text</Type>
          <Cols>4</Cols>
          <Data>
            <Option>None</Option>
          </Data>
          <Required>No</Required>          
         </Control>
        <Control>
          <Label>Last Name</Label>
          <ID>lastName</ID>
          <Type>Text</Type>
          <Cols>4</Cols>
          <Data>
            <Option>None</Option>
          </Data><Required>No</Required>
        </Control>
        <Control>
          <Label>State</Label>
          <ID>state</ID>
          <Type>Select</Type>
          <Cols>4</Cols>
          <Data>
            <Option>CA</Option>
            <Option>TX</Option>
          </Data><Required>No</Required>
        </Control>
        <Control>
          <Label>Do You Like Me?</Label>
          <ID>LikeIt</ID>
          <Type>Select</Type>
          <Cols>4</Cols>
          <Data>
            <Option>Yes</Option>
            <Option>No</Option>
          </Data>
          <Required>No</Required>
        </Control>        
      </Section>
    </Step>
    <Step ID="2">
      <Section>
        <Control>
          <Label>First Name</Label>
          <ID>firstName</ID>
          <Type>Text</Type>
          <Cols>4</Cols>
          <Data>
            <Option>None</Option>
          </Data><Required>No</Required>
        </Control>                  
      </Section>
    </Step>
    <Step ID="3">
      <Section>
        <Control>
          <Label>First Name</Label>
          <ID>firstName</ID>
          <Type>Text</Type>
          <Cols>4</Cols>
          <Data>
            <Option>None</Option>
          </Data><Required>No</Required>
        </Control>
        <Control>
          <Label>Last Name</Label>
          <ID>lastName</ID>
          <Type>Text</Type>
          <Cols>4</Cols>
          <Data>
            <Option>None</Option>
          </Data><Required>No</Required>
        </Control>
        <Control>
          <Label>State</Label>
          <ID>state</ID>
          <Type>Select</Type>
          <Cols>4</Cols>
          <Data>
            <Option>CA</Option>
            <Option>TX</Option>
          </Data><Required>No</Required>
        </Control>
      </Section>
  </Step>
</Structure>

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