public static void Main()
using (StreamWriter WriteNum = new StreamWriter("Number_File.txt"))
WriteNum.WriteLine("100");
WriteNum.WriteLine("25");
WriteNum.WriteLine("30");
WriteNum.WriteLine("75");
using (StreamReader readNum = new StreamReader("Number_File.Txt"))
while ((numLine = readNum.ReadLine()) != null )
if (Convert.ToUInt16(numLine) > 50 )
Console.WriteLine(numLine);