or
//Report1.Designer.cs : Designer Code behind (to display the report parameter setup that I have) reportParameter2.AllowBlank = false; reportParameter2.AutoRefresh = true; reportParameter2.MultiValue = true; reportParameter2.Name = "Parameter2"; reportParameter2.Text = "Checkbox List"; reportParameter2.Type = Telerik.Reporting.ReportParameterType.Integer; reportParameter2.Visible = true; this.ReportParameters.Add(reportParameter1); this.ReportParameters.Add(reportParameter2);// Default.aspx.cs public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { var report = new WebApplication1.Report1(); int[] CheckBoxList = { 0, 1 }; report.ReportParameters["Parameter2"].MultiValue = true; report.ReportParameters["Parameter2"].Value = CheckBoxList; //report.ReportParameters[1].Value = Gender; ReportViewer1.Report = report; ReportViewer1.RefreshReport(); } }