Adding items to generic list

You haven't said what the type parameter is for your generic List object (let's call it 'list'), but try this:

       System.Text.StringBuilder temp = new System.Text.StringBuilder();
       temp = temp.Append ("The items in your list are:");
       temp = temp.Append (Environment.NewLine);
       temp = temp.Append (Environment.NewLine);

       for(int i = 0; i < list.Count; i++)
       {
         temp = temp.Append((i+1).ToString());
         temp = temp.Append(" : ");
         temp = temp.Append(list[i].ToString());
         if (i < list.Count - 1)
            temp = temp.Append(Environment.NewLine);
       }

       string listStr = temp.ToString();
       temp = null;
       MessageBox.Show(listStr);

You could also, of course, display the list items in a control, such as a multiline textbox, with a line such as the following:

      textBox1.Text = listStr;