SSRS Drill through even

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SSRS

Below is the code I am using:

protected void ReportViewer1_Drillthrough(object sender, DrillthroughEventArgs e)
       {
           LocalReport localReport = (LocalReport)e.Report;
           localReport.DataSources.Add(new ReportDataSource("InfosourceReportsDS"));
       }

Below is the aspx for reportviewer:

<rsweb:ReportViewer ID="ReportViewer1" runat="server" Font-Names="Verdana" Font-Size="8pt"
            Height="800px" ProcessingMode="Remote" Width="1075px"
            ShowPrintButton="false" ExportContentDisposition="AlwaysInline"
            ondrillthrough="ReportViewer1_Drillthrough">
            <ServerReport ReportServerUrl="" />
            <LocalReport EnableHyperlinks="True">
            </LocalReport>
</rsweb:ReportViewer>

I am getting the below exception in the Drillthrough event at the below statement:
LocalReport localReport = (LocalReport)e.Report;

Exception:
cast Microsoft.Reporting.WebForms.ServerReport' to type 'Microsoft.Reporting.WebForms.LocalReport'