List Serialization and Deserialization by binary formatter

Question

I have a class. I wanna serialize and the serialize a list that contains object of that class. I want to use binary formatter. This is my class:

[Serializable]
public class Section :ISerializable
{
    private double ClearCover;
    private string SectionName;

    private double Diameter;

    public double Height;
    private double Width;

    private double InternalDiameter;
    private double ExternalDiameter;

    private double InternalHeight;
    private double ExternalHeight;
    private double InternalWidth;
    private double ExternalWidth;

    private double WebWidth;
    private double FlangeWidth;
    private double FlangeThickness;



    public double clearCover
    {
        get { return ClearCover; } 
        set { ClearCover = value; }
    }
    public string sectionName
    {
        get{return SectionName;} 
        set{SectionName=value;} 
    }

    public double diameter
    {
        get { return Diameter; } 
        set { Diameter = value; }
    }

    public double height
    {
        set { Height = value; }
        get { return Height; }
    }
    public double width
    {
        set { Width = value; }
        get { return Width; }
    }

    public double internalDiameter
    {
        set { InternalDiameter = value; } 
        get { return InternalDiameter; }
    }
    public double externalDiameter
    {
        set { ExternalDiameter = value; } 
        get { return ExternalDiameter; }
    }

    public double internalHeight
    {
        set { InternalHeight = value; }
        get { return InternalHeight; }
    }
    public double externalHeight
    {
        set { ExternalHeight = value; } 
        get { return ExternalHeight; }
    }
    public double internalWidth
    {
        set { InternalWidth = value; } 
        get { return InternalWidth; }
    }
    public double externalWidth
    {
        set { ExternalWidth = value; } 
        get { return ExternalWidth; }
    }

    public double flangeWidth
    {
        set { FlangeWidth = value; }
        get { return FlangeWidth; }
    }
    public double flangeThickness
    {
        set { FlangeThickness = value; }
        get { return FlangeThickness; }
    }
    public double webWidth
    {
        set { WebWidth = value; }
        get { return WebWidth; }
    }




    public Section() { }

    protected Section(SerializationInfo info, StreamingContext context)
    {
        sectionName = info.GetString("Section Name");
        clearCover = info.GetDouble("Clear Cover");

        diameter = info.GetDouble("Diameter");

        //internalDiameter = info.GetDouble("Internal Diameter");
        //externalDiameter = info.GetDouble("External Diameter");


        height = info.GetDouble("Height");
        width = info.GetDouble("Width");



        internalHeight = info.GetDouble("Internal Height");
        externalHeight = info.GetDouble("External Height");
        internalWidth = info.GetDouble("Internal Width");
        externalWidth = info.GetDouble("External Width");

        flangeWidth = info.GetDouble("Flange Width");
        flangeThickness = info.GetDouble("Flange Thickness");
        webWidth = info.GetDouble("Web Width");



    }

    public virtual void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        info.AddValue("Section Name", sectionName);
        info.AddValue("Clear Cover", clearCover);

        info.AddValue("Diameter",diameter);

        //info.AddValue("Internal Diameter", internalDiameter);
        //info.AddValue("External Diameter", externalDiameter);

        info.AddValue("Height",height);
        info.AddValue("Width",width);

        info.AddValue("Internal Height",internalHeight);
        info.AddValue("External Height",externalHeight);
        info.AddValue("Internal Width",internalWidth);
        info.AddValue("External Width",externalWidth);

        info.AddValue("Flange Width",flangeWidth);
        info.AddValue("Flange Thickness", flangeThickness);
        info.AddValue("Web Width", webWidth);


    }


}

I don't have any problem in serialization. But for deserialize, it can just deserialize first object not all of them. What should I do, please help me!