Error On Microsoft Report in wpf?

 private void Window_Loaded(object sender, RoutedEventArgs e)
        {
                dbl_cust = from recs in MainWindow.mcsEntity.mcs_custfeed
                           select recs;
                string c = dbl_cust.FirstOrDefault().mcs_CustFeed_Name.ToString();
                DataSet1 ds = new DataSet1();
                foreach (var custfee in dbl_cust)
                {
                    string cn = custfee.mcs_CustFeed_Name;
                    string cq = custfee.mcs_CustFeed_Qustion;
                    int yn = custfee.mcs_CustFeed_YesNo;
                    ds.Tables[0].Rows.Add(cn, cq, yn);
                }
 string dc = ConfigurationManager.AppSettings["Connection String"];
                ReportDataSource rds = new ReportDataSource("DataSet1",dc);
                reportViewer1.ProcessingMode = ProcessingMode.Local;
                reportViewer1.LocalReport.ReportPath = @"D:\Jagadeeswaran\Project\User\User\Report1.rdlc";
                reportViewer1.RefreshReport();
                host.Child = reportViewer1;
}
  }
        private void SetDBLogonForReport(ConnectionInfo connectionInfo, ReportDocument reportDocument)
        {
            Tables tables = reportDocument.Database.Tables;
            foreach (CrystalDecisions.CrystalReports.Engine.Table table in tables)
            {
                TableLogOnInfo tableLogonInfo = table.LogOnInfo;
                tableLogonInfo.ConnectionInfo = connectionInfo;
                table.ApplyLogOnInfo(tableLogonInfo);
            }
        }

<window x:class="User.FeedbackReport" xmlns:x="#unknown">
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   
        xmlns:crystal="clr-namespace:CrystalDecisions.Windows.Forms;assembly=CrystalDecisions.Windows.Forms"
        xmlns:viewer="clr-namespace:Microsoft.Reporting.WinForms;assembly=Microsoft.ReportViewer.WinForms"
        xmlns:dalsi="clr-namespace:Microsoft.Reporting.WinForms;assembly=Microsoft.ReportViewer.WinForms"
        Title="FeedbackReport" Height="700" Width="1000" Loaded="Window_Loaded" xmlns:my="clr-namespace:SAPBusinessObjects.WPF.Viewer;assembly=SAPBusinessObjects.WPF.Viewer" WindowStartupLocation="CenterScreen">
    <windowsformshost name="host" margin="0,34,0,0">
        <viewer:reportviewer x:name="reportViewer1" xmlns:viewer="#unknown" />
    </windowsformshost>
</window>