find the mode of all keys in a map in csharp

main.cs
using System.Linq;

// initialize dictionary
Dictionary<int, string> dict = new Dictionary<int, string> { { 1, "apple" }, { 2, "banana" }, { 3, "cherry" }, { 4, "apple" }, { 5, "banana" }, { 6, "banana" } };

// group keys by occurrence count
var groupCounts = dict.GroupBy(x => x.Key)
                      .GroupBy(x => x.Count());

// find the highest occurrence count
int modeCount = groupCounts.Max(x => x.Key);

// get the keys with the highest occurrence count
var modeKeys = groupCounts.First(x => x.Key == modeCount)
                         .Select(x => x.Key);

// output the mode keys
foreach (int key in modeKeys)
{
    Console.WriteLine($"Mode key: {key}");
}
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