Making my XML file multiline

I have a class that writes into an xml file and everything works fine, except, when I tell it to write into an xml file it saves everything in a single line and I want to make it readable for the rest of us. Does anyone have any idea on how to accomplish this? Here are the methods I am working with:

 private bool Load()
     {
         // Load our UserData into myData 
         LoadXML();
         if (_data.ToString() == "")
         {
             return false;
         }
         // notice how I use a reference to type (UserData) here, you need this 
         // so that the returned object is converted into the correct type
         var data = FixData();
         iData._users.Clear();
         var counter = 0;
         foreach (var dataToParse in data)
         {
             counter++;
             if (counter == 1) continue;
 
             if (string.IsNullOrEmpty(dataToParse.Trim())) continue;
             var uData = (UserData)DeserializeObject(dataToParse);
             iData._users.Add(uData._users[0]);
             var ud = iData._users[iData._users.Count - 1];
             // just a way to show that we loaded in ok
         }        
         return true;
     }
     string[] FixData()
     {
         var dataSplit = _data.Split(new string[] { "<mUsers>", "</mUsers>" }, System.StringSplitOptions.RemoveEmptyEntries);
         dataSplit[0] = dataSplit[0].Replace("<_users>", string.Empty);
         for (var indx = 1; indx < dataSplit.Length; indx++ )
         {
             if (string.IsNullOrEmpty(dataSplit[indx].Trim()) || !dataSplit[indx].Contains("x"))
             {
                 dataSplit[indx] = string.Empty;
                 continue;
             }
 
             dataSplit[indx] = dataSplit[0] + "<_users><mUsers>" + dataSplit[indx] + "</mUsers></_users></UserData>";
             Debug.Log(dataSplit[indx]);
         }
 
         return dataSplit;
     }
     
     /* The following metods came from the referenced URL */ 
     string UTF8ByteArrayToString(byte[] characters) 
     {      
         UTF8Encoding encoding = new UTF8Encoding(); 
         string constructedString = encoding.GetString(characters); 
         return (constructedString); 
     } 
     
     byte[] StringToUTF8ByteArray(string pXmlString) 
     { 
         UTF8Encoding encoding = new UTF8Encoding(); 
         byte[] byteArray = encoding.GetBytes(pXmlString); 
         return byteArray; 
     } 
     //// Here we serialize our UserData object of myData 
     string SerializeObject(UserData userData)
     {
         string XmlizedString = string.Empty;
         
         XmlSerializer xs = new XmlSerializer(typeof(UserData));
         MemoryStream memoryStream = new MemoryStream();
         XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);
         xs.Serialize(xmlTextWriter, userData);
         memoryStream = (MemoryStream)xmlTextWriter.BaseStream;
 
         XmlizedString = UTF8ByteArrayToString(memoryStream.ToArray());
         //foreach (var user in l_userData)
         //{
             
         //}
         
         return XmlizedString;
     }
 
     // Here we deserialize it back into its original form 
     object DeserializeObject(string pXmlizedString) 
     { 
         XmlSerializer xs = new XmlSerializer(typeof(UserData)); 
         MemoryStream memoryStream = new MemoryStream(StringToUTF8ByteArray(pXmlizedString)); 
         XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8); 
         return xs.Deserialize(memoryStream); 
     } 
     
     // Finally our save and load methods for the file itself 
     void CreateXML() 
     { 
         StreamWriter writer; 
         FileInfo t = new FileInfo(_FileLocation+"\\"+ _FileName); 
         if(!t.Exists) 
         { 
             writer = t.CreateText(); 
         } 
         else 
         { 
             t.Delete(); 
             writer = t.CreateText(); 
         } 
         writer.Write(_data); 
         writer.Close(); 
         Debug.Log("File written."); 
     } 
     
     void LoadXML() 
     {
         StreamReader r = File.OpenText(_FileLocation+"\\"+ _FileName); 
         string _info = r.ReadToEnd(); 
         r.Close(); 
         _data=_info; 
         Debug.Log("File Read"); 
     }