Error Code 403

Hi

  I am getting error - {
  "error": {
    "code": 403,
    "message": "The request cannot be completed because you have exceeded your \u003ca hef=\"/youtube/v3/getting-started#quota\"\u003equota\u003c/a\u003e.",
    "errors": [
      {
        "message": "The request cannot be completed because you have exceeded your \u003ca hef=\"/youtube/v3/getting-started#quota\"\u003equota\u003c/a\u003e.",
        "domain": "youtube.quota",
        "reason": "quotaExceeded"
      }
    ]
  }
}

In below code it is showing Null value.

tagResponse.Data.items

protected void MyOwnVideos11()
{
    StringBuilder htmlTable = new StringBuilder();

    string nextPageToken = string.Empty;
    Int32 Sr = 1;
    var data0 = GetVideosList(nextPageToken);
    var orderByPublishAt = data0.items.OrderBy(x => x.snippet.publishedAt);

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

    nextPageToken = data0.nextPageToken;
    while (!string.IsNullOrEmpty(nextPageToken))
    {
        data0 = GetVideosList(nextPageToken);
        orderByPublishAt = data0.items.OrderBy(x => x.snippet.publishedAt);
        nextPageToken = data0.nextPageToken;
        foreach (var data in orderByPublishAt)
        {
            var clientTag = new RestClient("googleapis.com/youtube/v3/");
            var tagRequest = new RestRequest("videos", Method.GET);
            tagRequest.AddParameter("key", "AIzaG8");
            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("");
                htmlTable.Append("");
                Sr = Sr + 1;
            }
        }
    }
    htmlTable.Append("");
    htmlTable.Append("
Sr.
Video Title
Description
Views
Like
Comment
Published
" + Sr + "
" + item.snippet.title + "
" + item.snippet.description + "
" + item.statistics.viewCount + "
" + item.statistics.likeCount + "
" + item.statistics.commentCount + "
" + data.snippet.publishedAt.ToString("dd-MM-yyyy") + "
");
    PlaceHolderTable.Controls.Add(new Literal { Text = htmlTable.ToString() });
}

private static YoutubeSearchListResponse GetVideosList(string nextPageToken)
{
    var client = new RestClient("googleapis.com/youtube/v3");
    var request = new RestRequest("search", Method.GET);
    request.AddParameter("part", "snippet");
    request.AddParameter("type", "video");
    request.AddParameter("channelId", "UoaVw");
    request.AddParameter("key", "AIzaG8");
    if (!string.IsNullOrEmpty(nextPageToken))
    {
        request.AddParameter("pageToken", nextPageToken);
    }
    var response = client.Execute(request);

    return response.Data;
}

Thanks