How would I search a range of ranged values using C#

Question

I have a list of values like this

1000, 20400
22200, 24444

The ranges don\'t overlap.

What I want to do is have a c# function that can

Answer 1

class Range
{
   public int Start { get; set; }
   public int End { get; set; }

   static Dictionary values;
   static int[] arrToBinarySearchIn;
   public static void BuildRanges(IEnumerable ranges) { 
        values = new Dictionary();
        foreach (var item in ranges)
            values[item.Start] = item;
        arrToBinarySearchIn = values.Keys.ToArray();
        Array.Sort(arrToBinarySearchIn);
   }
   public static Range GetRange(int value)
   {
       int searchIndex = Array.BinarySearch(arrToBinarySearchIn, value);
       if (searchIndex < 0)
           searchIndex = ~searchIndex - 1;
       if (searchIndex < 0)
           return null;
       Range proposedRange = values[arrToBinarySearchIn[searchIndex]];
       if (proposedRange.End >= value)
           return proposedRange;
       return null;
   }
}