LinqDataSource does not work with Microsoft.Reporting.LocalReport

//Creating report
        Microsoft.Reporting.WebForms.LocalReport report = new Microsoft.Reporting.WebForms.LocalReport();
        report.ReportPath = Request.PhysicalApplicationPath + @"pathToreport.rdlc";
        report.DisplayName = "Ttile";

        //Setting the data
        //SetMyLinqDataSource();
        myLinqDataSource.WhereParameters.Add(new Parameter("bla", avalue));
        myLinqDataSource.Where = "field1 = @bla";
        report.DataSources.Add(new Microsoft.Reporting.WebForms.ReportDataSource("MyDataSetName", myLinqDataSource));

        //delivering to web user
        Microsoft.Reporting.WebForms.Warning[] warnings;
        string[] streamids;
        string mimeType;
        string encoding;
        string extension;
        //Here the databind should happen
        byte[] bytes = report.Render("PDF", null, out mimeType, out encoding, out extension, out streamids, out warnings);

        Response.Clear();
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment; filename=Report.pdf");
        Response.Flush();
        Response.BinaryWrite(bytes);
        Response.Flush();