Most Viewed Catgeory Wise

Hello Ramco,

use below code. Its working fine and tested.

request.Type = "video";
request.VideoCategoryId = "10";

need to use small "v" instead of Capital "V".

Working code.

 private void Run()
    {
        var youtubeService = new YouTubeService(new BaseClientService.Initializer()
        {
            ApiKey = "REPLACE_ME",
            ApplicationName = this.GetType().ToString()
        });

        var searchListRequest = youtubeService.Search.List("snippet");
        searchListRequest.PublishedAfter = DateTime.Today;
        searchListRequest.PublishedBefore = DateTime.Today.AddDays(1);
        searchListRequest.Order = Google.Apis.YouTube.v3.SearchResource.ListRequest.OrderEnum.ViewCount;
        searchListRequest.Type = "video";
        searchListRequest.VideoCategoryId = "10";

        // Call the search.list method to retrieve results matching the specified query term.
        var searchListResponse = searchListRequest.Execute();

        List videos = new List();
        List channels = new List();
        List playlists = new List();

        // Add each result to the appropriate list, and then display the lists of
        // matching videos, channels, and playlists.
        foreach (var searchResult in searchListResponse.Items)
        {
            switch (searchResult.Id.Kind)
            {
                case "youtube#video":
                    videos.Add(String.Format("{0} ({1})", searchResult.Snippet.Title, searchResult.Id.VideoId));
                    break;

                case "youtube#channel":
                    channels.Add(String.Format("{0} ({1})", searchResult.Snippet.Title, searchResult.Id.ChannelId));
                    break;

                case "youtube#playlist":
                    playlists.Add(String.Format("{0} ({1})", searchResult.Snippet.Title, searchResult.Id.PlaylistId));
                    break;
            }
        }

        Console.WriteLine(String.Format("Videos:\n{0}\n", string.Join("\n", videos)));
        Console.WriteLine(String.Format("Channels:\n{0}\n", string.Join("\n", channels)));
        Console.WriteLine(String.Format("Playlists:\n{0}\n", string.Join("\n", playlists)));
    }

Please mark answer accepted if its useful. 

Thanks

Naimish