or
using System.Collections.Generic;using System.Linq;using Telerik;using Telerik.Reporting;namespace MyReport{ public partial class MainWindow { public MainWindow() { InitializeComponent(); var project = new List<Project>(); var pro = new Project {Name = "Name One", Nos = new List<int> {1, 2, 3, 4, 5}}; project.Add(pro); pro = new Project {Name = "Name Two", Nos = new List<int> {1, 2, 3, 4, 5}}; project.Add(pro); var reportSource = new InstanceReportSource {ReportDocument = new SampleReport()}; reportSource.ReportDocument.Reports.FirstOrDefault(rep => rep.Name == "SampleReport").DataSource = project; reportViewer1.ReportSource = reportSource; } private class Project { public string Name { get; set; } public List<int> Nos { get; set; } } }}