rdlc set datasource at runtime

I have winform client in C# that has a simple rdlc report in a reportviewer. I created an xsd file and added a datatable at design time and the report works fine. Now I am using the same report but the datatable comes from a webservice method. In the form load, I set the report's datasource to the datatable. I get no error but my report is blank. I can see the webservice is returning multiple rows.
DataTable HistoryTable = objwS.GetHistory(TNo);
            this.reportViewer1.LocalReport.ReportPath = "Report1.rdlc";
            this.reportViewer1.Reset();
            this.reportViewer1.LocalReport.DataSources.Clear();
            this.reportViewer1.LocalReport.DataSources.Add(new Microsoft.Reporting.WinForms.ReportDataSource("History",HistoryTable));

            this.reportViewer1.RefreshReport();

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tornadogAsked:
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RameshSCommented:
One more helpful link.
Reportviewer Untyped Dataset
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