C# proper way to construct ISerializable interface?

I recently made my own custom formatter, it takes a runtime object and writes down an object graph of it in a string format then takes that string and converts it back to a runtime object. Example: [CustomFormatter.Btype, CustomFormatter, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null==[a==5][b==0]]

after messing around with primitive objects (int, bool, float...) I tried to serialize a Bitmap object into string using the ISerializable interface and it worked well but when I try to reconstruct the object back I'm getting an error System.MissingMethodException: Constructor on type 'System.Drawing.Bitmap' not found.

If bitmap doesn't have a constructor which takes SerializationInfo and StreamingContext as parameters how else can an object which inherits the ISerializable interface be constructed?

This part is is the main issue but I can include the whole code:

        private static object SeriObjConstructor(Type objType, ref string dataInfo, ref int location)
        {
            SerializationInfo info = new SerializationInfo(objType, new FormatterConverter());
            StreamingContext context = new StreamingContext(StreamingContextStates.All);
            location += serializerEntry.Length;
            while (!CheckHitOperator(dataInfo, serializerExit, ref location))
            {
                KeyValuePair<string, Type> serializedObj = GetSerialiedName(ref dataInfo, ref location); //<name, type>
                info.AddValue(serializedObj.Key, Construction(serializedObj.Value, ref dataInfo, ref location));
            }
            location += serializerExit.Length;
            location += endClass.Length;

            var instance = Activator.CreateInstance(objType, info, context); //THROWS AN ERROR
            return instance;
        }