How to Convert "&lt" and "&gt" into xml tags in xml response

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C#

ASP.NET

XML

C#4.0

Hi,
I am trying to get xml response.
It gives me response but not in proper format
It converts the xml tag into "<" and ">"

It give the response in following manner

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="www.detroittradingexchange.com/">&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;PINGGX_RESPONSE xmlns="www.detroittradingexchange.com/SellerMessages" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="www.detroittradingexchange.com/SellerMessages
http://www.detroittradingexchange.com/SellerMessages/SellGx_response.xsd"&gt;
  &lt;DTX_LEAD_ID&gt;-1&lt;/DTX_LEAD_ID&gt;
  &lt;SUCCESS&gt;False&lt;/SUCCESS&gt;
  &lt;CACHED_RESPONSE&gt;False&lt;/CACHED_RESPONSE&gt;
  &lt;PRICE&gt;0.0&lt;/PRICE&gt;
  &lt;REASON&gt;UNKNOWN_GEN&lt;/REASON&gt;
  &lt;REASON_MESSAGE&gt;Invalid Login&lt;/REASON_MESSAGE&gt;
  &lt;ERROR&gt;&lt;/ERROR&gt;
  &lt;ERROR_MESSAGE&gt;&lt;/ERROR_MESSAGE&gt;
&lt;/PINGGX_RESPONSE&gt;</string>

I want to convert into proper xml format like


Please help me