2PTTechnology

ControlCollection cc = this.ReportViewer1.Parent.Controls;
 //get index of previous ReportViewer so we can swap it out.
 int prevIndex = cc.IndexOf(this.ReportViewer1);
 
 // Remove previous ReportViewer
 cc.Remove(this.ReportViewer1);
 
 //add new instance of ReportViewer. 
 ReportViewer1 = new Microsoft.Reporting.WebForms.ReportViewer();
 
 // Reset report properties.
 ReportViewer1.Height = Unit.Parse("100%");
 ReportViewer1.Width = Unit.Parse("100%");
 ReportViewer1.CssClass = "table";
 
 //Add the new ReportViewer to the previous ReportViewer location.
 cc.AddAt(prevIndex, ReportViewer1);

 // Clear out any previous datasources.
 this.ReportViewer1.LocalReport.DataSources.Clear();
 
 //Set report mode for local processing.
 ReportViewer1.ProcessingMode = ProcessingMode.Local;