C# Adding a Class To List changes all data previously added

Question

 

C# Adding a Class To A List Of Classes changes all data in previously added Classes.
The new class is added to the list as expected.
But data in every class that has been previously added changes to match the newly added class.

tCardInfo2.Add(new TCardInfoClass(cardType.ToString(),strReqID, true));

public static List<TCardInfoClass> tCardInfo2 = new List<TCardInfoClass>();

public class TCardInfoClass // dragon
    {
       static private string arrayID;
       static private string reqId;
       static private bool visible = false;

      public TCardInfoClass(string ArrayID, string ReqID, bool Visible)
      {
        arrayID = ArrayID;
        reqId = ReqID;
        visible = Visible;
      }

    }