I have List and inheritance problem question pls tell me what I can do

[thedoxp]

I'm new at c# and I have little problem when use List and Inheritance

I have Inheritance& Like this

public abstract class Light
{}

public class OpenLight:Light
{}

public class WhiteLight:OpenLight
{}
public class BlackLight:OpenLight
{}

White & Black is Inheritance have data I use but not save that why I create

public tool<T> where T:Light
{//in this have data for save and Ignoretype like this
[XmlIgnore]
public T Content { get; set; }}

now I have to create and add to list

public List<tool<OpenLight>> LightList=new List<tool<OpenLight>>();

...then I want to add to type of WhiteLight,BlackLight what is Inheritance of OpenLight but I error when I do like this

EX1

tool<WhiteLight> Lights= new tool<WhiteLight>();

LightList.Add(Lights);

...It not work error and want only add tool<OpenLight>

but I can use like this

EX2

tool<OpenLight> Lights= new
WhiteLight x;
BlackLight y;

LightList.Add(Lights);
LightList[0].Content = x;
LightList.Add(Lights);
LightList[1].Content = y;


It's pass and can use but I don't understand.I want Ex1 work what I can do.

Thank you.

[GaryTexmo]

This is very hard to read, but I think you need to use AddRange, not Add, when adding a list of data to another list.