Public Overrides Function Render ( _
	format As String, _
	deviceInfo As String, _
	<OutAttribute> ByRef mimeType As String, _
	<OutAttribute> ByRef encoding As String, _
	<OutAttribute> ByRef fileNameExtension As String, _
	<OutAttribute> ByRef streams As String(), _
	<OutAttribute> ByRef warnings As Warning() _
) As Byte()

Dim instance As LocalReport
Dim format As String
Dim deviceInfo As String
Dim mimeType As String
Dim encoding As String
Dim fileNameExtension As String
Dim streams As String()
Dim warnings As Warning()
Dim returnValue As Byte()

returnValue = instance.Render(format, deviceInfo, mimeType, encoding, fileNameExtension, streams, warnings)

public override byte[] Render (
	string format,
	string deviceInfo,
	out string mimeType,
	out string encoding,
	out string fileNameExtension,
	out string[] streams,
	out Warning[] warnings
)

public:
virtual array<unsigned char>^ Render (
	String^ format, 
	String^ deviceInfo, 
	[OutAttribute] String^% mimeType, 
	[OutAttribute] String^% encoding, 
	[OutAttribute] String^% fileNameExtension, 
	[OutAttribute] array<String^>^% streams, 
	[OutAttribute] array<Warning^>^% warnings
) override

public byte[] Render (
	String format, 
	String deviceInfo, 
	/** @attribute OutAttribute() */ /** @ref */ String mimeType, 
	/** @attribute OutAttribute() */ /** @ref */ String encoding, 
	/** @attribute OutAttribute() */ /** @ref */ String fileNameExtension, 
	/** @attribute OutAttribute() */ /** @ref */ String[] streams, 
	/** @attribute OutAttribute() */ /** @ref */ Warning[] warnings
)

JScript does not support passing value-type arguments by reference.

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Microsoft.Reporting.WebForms;
using System.IO;

public partial class _Default : System.Web.UI.Page 
{
    private DataTable LoadSalesData()
    {
        // Load data from XML file.
        DataSet dataSet = new DataSet();
        dataSet.ReadXml(@"c:\Reports\data.xml");
        return dataSet.Tables[0];
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        this.ReportViewer1.ProcessingMode = ProcessingMode.Local;
        this.ReportViewer1.LocalReport.ReportPath = 
           @"c:\Reports\Report1.rdl";
        ReportViewer1.LocalReport.DataSources.Add(
           new ReportDataSource("Sales", LoadSalesData()));

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
            Warning[] warnings;
            string[] streamids;
            string mimeType;
            string encoding;
            string extension;

            byte[] bytes = ReportViewer1.LocalReport.Render(
               "Excel", null, out mimeType, out encoding, 
                out extension, 
               out streamids, out warnings);

            FileStream fs = new FileStream(@"c:\output.xls", 
               FileMode.Create);
            fs.Write(bytes, 0, bytes.Length);
            fs.Close();

            Label1.Text = "Report exported to output.xls";

        }
 }

Imports System.IO
Imports System.Data
Imports Microsoft.Reporting.WebForms


Partial Class _Default
    Inherits System.Web.UI.Page

    Private Function LoadSalesData() As DataTable
        '' Load data from XML file
        Dim dataSet = New DataSet
        dataSet.ReadXml("c:\Reports\data.xml")
        Return dataSet.Tables(0)
    End Function

    Protected Sub Page_Load(ByVal sender As Object, _
      ByVal e As System.EventArgs) Handles Me.Load
        ReportViewer1.ProcessingMode = ProcessingMode.Local
        ReportViewer1.LocalReport.ReportPath = _
              "c:\Reports\Report1.rdl"
        Dim myDataSource = New ReportDataSource("Sales", _
           LoadSalesData())
        ReportViewer1.LocalReport.DataSources.Add(myDataSource)
    End Sub

    Protected Sub Button1_Click(ByVal sender As Object, _
      ByVal e As System.EventArgs) Handles Button1.Click
        Dim warnings As Warning() = Nothing
        Dim streamids As String() = Nothing
        Dim mimeType As String = Nothing
        Dim encoding As String = Nothing
        Dim extension As String = Nothing
        Dim bytes As Byte()

        bytes = ReportViewer1.LocalReport.Render("Excel", _
          Nothing, mimeType, _
            encoding, extension, streamids, warnings)

        Dim fs As New FileStream("c:\outputvb.xls", FileMode.Create)
        fs.Write(bytes, 0, bytes.Length)
        fs.Close()

        Label1.Text = "Report exported to output.xls"

    End Sub
End Class