.NET 4.0 Generics Beginner's Guide

Time for action – dealing with the change in the list of names in the first tab

Follow the given step:

1. Add the following event handler in Form1.cs:

   private void textBox1_Leave(object sender, EventArgs e)
   {
     string[] toks = textBox1.Text.Split(new char[]{ '\r', '\n' },
     StringSplitOptions.RemoveEmptyEntries);
     foreach (string tok in toks)
     if(!tweeterUserNames.Contains(tok))
     tweeterUserNames.Add(tok);
     List<string> copyNames = tweeterUserNames.ToList();
     foreach (string tok in copyNames)
     {
       if (!toks.Contains(tok))//The name is deleted
       {
         tweeterUserNames.Remove(tok);
       }
     }
   }

What just happened?

We want to monitor the changes being made in the list of Twitter user IDs in the first tab. So, whenever the control leaves this textbox, we want to see whether there ...