//choose project to see chart private void dropDown_projects_SelectedIndexChanged(object sender, Telerik.WinControls.UI.Data.PositionChangedEventArgs e) { Dictionary <string, decimal> workersDictionary = new Dictionary <string, decimal>(); int idProjectSelect = (dropDown_projects.SelectedItem.Tag as Project).ProjectId; List <SumHoursDoneUser> sumHoursDoneUsers = UserRequests.GetSumHoursDoneForUsers(idProjectSelect); if (sumHoursDoneUsers != null) { foreach (SumHoursDoneUser sumHoursDoneUser in sumHoursDoneUsers) { workersDictionary.Add(sumHoursDoneUser.Label, sumHoursDoneUser.Data); } chart1.Series[0].Points.DataBindXY(workersDictionary.Keys, workersDictionary.Values); } }