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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace WindowsFormsApplication2
{
    class MyClass<T>
    {
    }
 
    class MyClassEx<T> : MyClass<T>
    {
        public MyClassEx() { this.Items = new List<T>(); }
        public List<T> Items { get; set; }
    }
 
 
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
 
            var a = new MyClassEx<string>();
            a.Items.Add("test");
            this.Text = a.Items[0];
        }
    }
}
 

prog.cs(4,14): error CS0234: The type or namespace name `Data' does not exist in the namespace `System'. Are you missing an assembly reference?
prog.cs(5,14): error CS0234: The type or namespace name `Drawing' does not exist in the namespace `System'. Are you missing an assembly reference?
prog.cs(8,14): error CS0234: The type or namespace name `Windows' does not exist in the namespace `System'. Are you missing an assembly reference?
Compilation failed: 3 error(s), 0 warnings

Standard output is empty