No of subscribes in a video

StringBuilder htmlTable = new StringBuilder();

var client = new RestClient("https://www.googleapis.com/youtube/v3");
var request = new RestRequest("search", Method.GET);
request.AddParameter("part", "snippet");
request.AddParameter("type", "video");
request.AddParameter("channelId", "UCg3Zm_nNoaVw");
request.AddParameter("key", "AIzaSyAu9f5blF7idzt6cGul59UQ9b5Ls8ECFG8");

List allItems = new List();

IRestResponse response = client.Execute(request);

htmlTable.Append("");
htmlTable.Append("");
htmlTable.Append("");

// Fetch channel details to get subscriber count
var channelClient = new RestClient("https://www.googleapis.com/youtube/v3");
var channelRequest = new RestRequest("channels", Method.GET);
channelRequest.AddParameter("part", "statistics");
channelRequest.AddParameter("id", "UCg3Zm_nNoaVw");
channelRequest.AddParameter("key", "AIzaSyAu9f5blF7idzt6cGul59UQ9b5Ls8ECFG8");

IRestResponse channelResponse = channelClient.Execute(channelRequest);
string subscriberCount = "N/A";

if (channelResponse.Data != null && channelResponse.Data.items.Any())
{
    subscriberCount = channelResponse.Data.items[0].statistics.subscriberCount;
}

foreach (var data in allItems.OrderBy(x => x.snippet.publishedAt))
{
    var clientTag = new RestClient("https://www.googleapis.com/youtube/v3/");
    var tagRequest = new RestRequest("videos", Method.GET);
    tagRequest.AddParameter("key", "AIzaSyAu9FG8");
    tagRequest.AddParameter("part", "snippet,statistics");
    tagRequest.AddParameter("id", data.id.videoId);
    var tagResponse = clientTag.Execute(tagRequest);

    foreach (var item in tagResponse.Data.items)
    {
        htmlTable.Append("");
        htmlTable.Append("");
        htmlTable.Append("");
        htmlTable.Append("");
        htmlTable.Append("");
        htmlTable.Append("");
    }
}
htmlTable.Append("");
htmlTable.Append("
Video Id
Video Title
Description
Subscribers
" + data.snippet.title + "
" + item.snippet.title + "
" + item.snippet.description + "
" + subscriberCount + "
");
PlaceHolderTable.Controls.Add(new Literal { Text = htmlTable.ToString() });

Try this