Question

i have a loop where a variable value will change in each loop and display those values in each loop. i need to skip the display of the value if the same value repeats from second time

Answer 1

You need to remove the duplicates from the list. Ive chosen StringCollection from the System.Collections.Specialized namespace. But you could use List from System.Collections.Generic

String[] strings = new String[] { "1", "2", "3", "4", "2", "5", "4", "6", "7" };
StringCollection unique = new StringCollection();

foreach (String s in strings)
{
     if (!unique.Contains(s))
         unique.Add(s);
}

foreach (String s in unique)
{
     Console.WriteLine(s);
}