Console.WriteLine(Encoding.UTF8.GetString(obj, 0, 20)); 

BinaryFormater bf = new BinaryFormater();
byte[] bytesArr;
Using (var ms = new MemoryStream())
{
bf.Serialize(ms, obj);
bytesArr = ms.ToArray;
Console.WriteLine(Encoding.UTF8.GetString(bytesArr, 0, 20));
}

BinaryFormater bf = new BinaryFormater();
Using (var ms = new MemoryStream())
{
bf.Serialize(ms, obj);
Using (BinaryReader reader = new BinaryReader(ms))
{
Console.WriteLine(reader.ReadString());
}
}

BinaryFormater bf = new BinaryFormater();
Using (var ms = new MemoryStream())
{
bf.Serialize(ms, obj);
Using (BinaryReader reader = new BinaryReader(ms))
{
while (reader.PeekChar() > -1)
{
Console.WriteLine(reader.ReadString());
}
}
}

<Types>
 <Type name="typeA">
  <String name="str" Length="20">
  <Float name="floatVal">
  <Int name="intVal">
 <Type/>
  <Type name="typeB">
  <String name="str" Length="20">
  <Float Length="4" name="floatVal">
  <Int Length="2" name="intVal">
 <Type/>
<Types/>

Class types
{
 Class typeA
 {
   public string str;
   public float floatVal;
   public int intVal;
   public typeAFill(string str1, float floatVal1, int intVal1)
   {
     str = str1;
     floatVal = floatVal1;
     intVal = intVal1;
   }
 }
 Class typeB
 {
   public string str;
   public float floatVal;
   public int intVal;
   public typeAFill(string str1, float floatVal1, int intVal1)
   {
     str = str1;
     floatVal = floatVal1;
     intVal = intVal1;
   }
 }
}

BinaryFormater formatter = new BinaryFormater();
using (Stream stream = new Stream(bytes[])
{
 types newType = (types)formatter.Deserialize(stream);
}