how can i change console code to win Forms

Question

public static decimal GetMedian(this IEnumerable < int > source) {
 // Create a copy of the input, and sort the copy
 int[] temp = source.ToArray();
 Array.Sort(temp);
 int count = temp.Length;
 if (count == 0) {
  throw new InvalidOperationException("Empty collection");
 } else if (count % 2 == 0) {
  // count is even, average two middle elements
  int a = temp[count / 2 - 1];
  int b = temp[count / 2];
  return (a + b) / 2 m;
 } else {
  // count is odd, return the middle element
  return temp[count / 2];
 }
}
public static int GetMode(this IEnumerable < int > list) {
  // Initialize the return value
  int mode =
   default (int);
  // Test for a null reference and an empty list
  if (list != null && list.Count() > 0) {
   // Store the number of occurences for each element
   Dictionary < int, int > counts = new Dictionary < int, int > ();
   // Add one to the count for the occurence of a character
   foreach(int element in list) {
    if (counts.ContainsKey(element))
     counts[element]++;
    else
     counts.Add(element, 1);
   }
   // Loop through the counts of each element and find the
   // element that occurred most often
   int max = 0;
   foreach(KeyValuePair < int, int > count in counts) {
    if (count.Value > max) {
     // Update the mode
     mode = count.Key;
     max = count.Value;
    }
   }
  }
  return mode;