Passing multiparameter from querystring to rdlc report

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Visual-Studio

VS2010

Parameter

, +

I have two webpages

First page has a button on clicking which second page is called which contains rdlc report


First Page

string vendors = "&Id=7&Id=35";

     protected void Page_Load(object sender, EventArgs e)
     {

     }

     protected void Button1_Click(object sender, EventArgs e)
     {
         Response.Redirect("WebForm1.aspx?"+vendors );
     }

Here Id is multiparameter value


Page Two

string str = Request.QueryString["Id"];

               ReportViewer1.LocalReport.DataSources.Add(new Microsoft.Reporting.WebForms.ReportDataSource
                    ("dsReport", SqlDataSource1));
               List<ReportParameter> parameters = new List<ReportParameter>();

               parameters.Add(new ReportParameter("Id", str));

               ReportViewer1.LocalReport.SetParameters(parameters);

This gives me oracle error(ORA-01722: invalid number ). Pls Help