My question is simple. I want to make sure LoadXml() works on below string.

"<?xml version='1.0' encoding='UTF-8'?><PDB><TRANSACTION_TYPE><TYPE>ERROR</TYPE></TRANSACTION_TYPE><ERROR><DESCRIPTION>Bad Input. Please check.</DESCRIPTION></ERROR></PDB>"

I tried all solutions at below links but nothing working for me in C# using .NET Framework 4.5.2

xml.LoadData – Data at the root level is invalid. Line 1, position 1

Why “Data at the root level is invalid. Line 1, position 1.” for XML Document?

StartsWith change in Windows Server 2012

I am calling a API which I do not have any control on it.

After doing string responseData = reader.ReadToEnd();

In responseData I have string like this

"<?xml version='1.0' encoding='UTF-8'?><PDB><TRANSACTION_TYPE><TYPE>ERROR</TYPE></TRANSACTION_TYPE><ERROR><DESCRIPTION>Bad Input. Please check.</DESCRIPTION></ERROR></PDB>"

I tried many codes like below and no matter what I try everytime I get

System.Xml.XmlException: Data at the root level is invalid. Line 1, position 201.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.ParseRootLevelWhitespace()
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
   at System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc)
   at System.Xml.XmlDocument.Load(XmlReader reader)
   at System.Xml.XmlDocument.LoadXml(String xml)

Below is sample code.

using (HttpWebResponse response = (HttpWebResponse)httpWebRequest.GetResponse())
     {
       if (response.StatusCode == HttpStatusCode.Created)
       {
         using (var respStream = response.GetResponseStream())
           {
             using (var reader = new System.IO.StreamReader(respStream, true))
               {
                 string responseData = reader.ReadToEnd();
                 if (responseData.Contains(@"<TYPE>ERROR</TYPE>"))
                 {
                   string _byteOrderMarkUtf8 = Encoding.UTF8.GetString(Encoding.UTF8.GetPreamble());
                    if (responseData.StartsWith(_byteOrderMarkUtf8, StringComparison.Ordinal))
                    {
                       responseData = responseData.Remove(0, _byteOrderMarkUtf8.Length);
                    }
                    XmlDocument doc = new XmlDocument();
                    doc.LoadXml(responseData);
                    }
                }
            }
        }
    }