XML Schema deserialize Error with XS attribute

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C#

I need to serialize xml schema file(.xsd). While serializing objects I got an error "tt:" prefix is not defined. Can any one solve this issue? Find the xml schema file below.

<?xml version="1.0" encoding="utf-8" ?>
- <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:tds="http://www.my.org/ver10/device/wsdl" xmlns:trt="http://www.my.org/ver10/media/wsdl" xmlns:tt="http://www.my.org/ver10/schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tev="http://www.my.org/ver10/events/wsdl" xmlns:wsnt="http://docs.oasis-open.org/wsn/b-2" xmlns:wstop="http://docs.oasis-open.org/wsn/t-1" xmlns:wsa="http://www.w3.org/2005/08/addressing" xmlns:tptz="http://www.my.org/ver10/ptz/wsdl" xmlns:tns1="http://www.my.org/ver10/topics" xmlns:tnsaxis="http://www.camera.com/2009/event/topics">
- <soap:Body>
- <tds:GetCapabilitiesResponse>
- <tds:Capabilities xsi:type="tt:Capabilities">
- <tt:Media xsi:type="tt:MediaCapabilities">
<tt:XAddr>http://192.168.3.101/onvif</tt:XAddr>
- <tt:StreamingCapabilities xsi:type="tt:RealTimeStreamingCapabilities">
<tt:RTPMulticast>true</tt:RTPMulticast>
<tt:RTP_TCP>true</tt:RTP_TCP>
<tt:RTP_RTSP_TCP>true</tt:RTP_RTSP_TCP>
</tt:StreamingCapabilities>
- <tt:Extension xsi:type="tt:MediaCapabilitiesExtension">
- <tt:ProfileCapabilites xsi:type="tt:ProfileCapabilities">
<tt:MaximumNumberOfProfiles>5</tt:MaximumNumberOfProfiles>
</tt:ProfileCapabilites>
</tt:Extension>
</tt:Media>
</tds:Capabilities>
</tds:GetCapabilitiesResponse>
</soap:Body>
</soap:Envelope>

I am using this method to deserialize the shcema file.

XmlSerializer xmlSerializer;
MemoryStream memStream = null;
try
{
   xmlSerializer = new XmlSerializer(type);
   byte[] bytes = new byte[xmlString.Length];
   Encoding.ASCII.GetBytes(xmlString, 0, xmlString.Length, bytes, 0);
   memStream = new MemoryStream(bytes);
   object objectFromXml = xmlSerializer.Deserialize(memStream);
   return objectFromXml;
}
catch (Exception Ex)
{
   throw Ex;
}
finally
{
   if (memStream != null) memStream.Close();
}

[edit]Code block added - OriginalGriff[/edit]