static variable remove and c# duplication problem

Question

Hello everyone,

 

I want to pass list items to one class to anther class. I have used static keyword. But now, when the application is running still old variable is there.

 

This is my 1st class, 

foreach (DocumentsUser item in listView1.SelectedItems)
           {
               ImgName.Add(item.Parent_File_Name);
               UserId.Add((int)item.UserId);
           }

private static readonly List<string> imgName = new List<string>();
       public static List<string> ImgName { get { return imgName; } }

       private static readonly List<int> userId = new List<int>();
       public static List<int> UserId { get { return userId; } }

 And this is 2nd class, I want to access class 1 list each object.

 

foreach (var userId in Qscan.UC_FileMgmt.UserId)
           {
               foreach (var imgName in Qscan.UC_FileMgmt.ImgName)
               {

Please help me...