I am trying to read this XML document with XDocument in c sharp.

```
  <Instrument_Root>
    <Instrument_ID>123</Instrument_ID>
    <Deal_number xsi:nil="true"/>
  </Instrument_Root>

```

I use the below code to read the XML doc:

```
   XDocument xDoc = XDocument.Load("XMLFile1.xml");

```

I receive an error message because of the xsi:nil

Error merssage:An unhandled exception of type 'System.Xml.XmlException' occurred in System.Xml.dll 'xsi' not declared.

Is there a way to treat xsi as NULL?

Thank you