Question

I have certain classes that have common feature – class factory that I need to put into base class.

// This class needs to be designed
public class Base
{
    // this function is no good because it returns object, and needs to return derived class
    static object Create(byte[] data)
    {
        MemoryStream ms = new MemoryStream(data);
        BinaryFormatter sf = new BinaryFormatter();

        object result = sf.Deserialize(ms);
        ms.Close();

        return result;
    }

    public virtual byte[] Serialize()
    {
        MemoryStream ms = new MemoryStream();
        BinaryFormatter bf = new BinaryFormatter();
        bf.Serialize(ms, this);
        byte[] result = ms.ToArray();
        ms.Close();
        return result;
    }

}

// for this class Create() must return Derived1
public Derived1 : Base
{
}

// for this class Create() must return Derived2
public Derived2 : Base
{
}

I need to be able to use derived class factory like that

Derived1 d1 = Derived1.Create(data1);

Derived2 d2 = Derived2.Create(data2);

Please advice solution. The templates are ok

UPDATE

I update the code and showed how objects are serialized and deserialized

Answer 1

public class Base<T>
{
    public static T Create(byte[] data)
    {
        // create instance of T from data
    }
}

public Derived1 : Base<Derived1>
{
}

public Derived2 : Base<Derived2>
{
}