C#

namespace ExampleConvertList
{
    public partial class Form1 : Form
    {
        private List<TestGridImage> list;

        public Form1()
        {
            InitializeComponent();

            // I want to convert code have got List...
                        list = new List<TestGridImage>()
                       {
                             new TestGridImage() { KeyIndex = 0, KeyIndexAlt = 2 },
                             new TestGridImage() { KeyIndex = 1, KeyIndexAlt = 0 },
                             new TestGridImage() { KeyIndex = 2, KeyIndexAlt = 1 }
                       };
                       this.gridControl1.DataSource = list;

        }
    }

    public class TestGridImage
    {
        private int keyIndex;

        private int keyIndexAlt;

        public int KeyIndex
        {
            get { return keyIndex; }
            set { keyIndex = value; }
        }

        public int KeyIndexAlt
        {
            get { return keyIndexAlt; }
            set { keyIndexAlt = value; }
        }
    }
}

private void btnGroupsForUserTest_Click(object sender, EventArgs e)
  {

      progressBarControl pbarcontrol = new progressBarControl();
      pbarcontrol.pbarIncrementValue = 1;
      pbarcontrol.pbarMaximum = 100;
      pbarcontrol.pbarThreadSleepIncrement = 250;
      pbarcontrol.pbarObject = pBarGroupsForUser;
      pbarcontrol.pbarLabel = lblGroupsForUserStatus;

      progressBarIncrementer = new Thread(new ThreadStart(pbarcontrol.pbarIncrementFunction));
      progressBarIncrementer.IsBackground = true;
      progressBarIncrementer.Start();
      }

public class progressBarControl : FormGroupMemberShipCheckingTool
{
    public ProgressBar pbarObject;// { get; set; }
    public Label pbarLabel;// { get; set; }


    public int pbarMaximum { get; set; }
    public int pbarIncrementValue { get; set; }
    public int pbarThreadSleepIncrement { get; set; }

    public void pbarIncrementFunction()
    {

        int incrementValue = pbarIncrementValue;
        do
        {
            this.Invoke((MethodInvoker)delegate()
            {
                if (incrementValue < pbarMaximum)
                {
                    pbarObject.Value = incrementValue;
                    pbarLabel.Text = incrementValue.ToString() + "% complete";
                    Application.DoEvents();
                }
            });
            incrementValue++;
            Thread.Sleep(pbarThreadSleepIncrement);
        } while (incrementValue < pbarMaximum);
    }

}