Stack Overflow in C#

I have this register that registers all the objects I need:

public static class ObjectRegister
{
    public static List<IObject> RegisteredObjects = new List<IObject>();
    static ObjectRegister()
    {
        RegisteredObjects.Add(new Object1());
        RegisteredObjects.Add(new Object2());
        RegisteredObjects.Add(new Object3());
    }
}

Next I have this function that checks a list and if the items in the list pass the test, it creates an object instance and adds it to the list:

public static List<IObject> Scan(List<parametar> list)
    {
        List<IObject> neededObjects = new List<IObject>();
        foreach (IObject registeredObject in ObjectRegister.RegisteredObjects)
        {
            foreach (parametar param in list)
            {
                if (registeredObject.Test(param)) //returns true or false 
                {
                    neededObjects.Add(registeredObject.CreateInstance(param));
                }
            }
        }
        return connectedObjects;
    }

Here is the CreateInstace method for Object1:

public IObject CreateInstance(parametar param)
    {
        return new Object1(param);
    }

And here is the constructor:

public Object1(parametar newParam)
    {
        this.param = newParam;
    }

It keeps trowing StackOverflow exception on this line:

this.param = newParam;

Tried all the possibilities for creating an instance, default constructor, empty object etc etc, but nothing worked... any ideas?

Thanx

EDIT: Code to the Object1 class:

public class Object1: IObject
{
    public parametar param
    {
        get { return this.param; }
        set { this.param = value; }
    }

    internal Object1() { }

    public Object1(parametar newParam)
    {
        this.param = newParam;
    }        


    public bool test(parametar param)
    {
        // I do the propper checking of the param here, and return the result
    }


    public IObject CreateInstance(parametar param)
    {
        return new Object1(param);
    }
}