ASP.NET

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private DefaultVM vm;

protected void Page_Load(object sender, EventArgs e)
{
this.vm = new DefaultVm();
}

public int TestValue { get;set;}

public void DefaultVM()
{
TestValue = 10;
}

<asp:Label runat="server" Text="<%# vm.TestValue%>"/>
<asp:Label runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"TestValue")%>'/>
<asp:Label runat="server" Text='<%# DataBinder.Eval(vm,"TestValue")%>'/>

public static void Export(Page webPage)
{
    webPage.Response.Clear();
    webPage.Response.Buffer = true;
    webPage.Response.Charset = "";
    webPage.EnableViewState = false;

    string filename = "spreadsheet.xls";
    webPage.Response.ContentType = "application/vnd.ms-excel";
    webPage.Response.ContentEncoding = Encoding.Default;
    webPage.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName + ";");

    string filePath = string.Format("{0}temp\\{1}", webPage.Request.PhysicalApplicationPath, fileName);
    populate(filePath);

    webPage.Response.TransmitFile(filePath);
    webPage.Response.Flush();
    File.Delete(filePath);

    webPage.Response.End();
}