Problem with reprot viewer in user control.

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I added report viewer to user control and used it in a page. i passed data table to report viewer but report viewer can't be displayed.

this is my ascx code

<table align="center">
        <tr>
            <td>
                <asp:LinkButton runat="server" ID ="lbtnShowInstalledPrinters" Text ="Show Installed Printers" OnClientClick="showInstalledPrinters()"></asp:LinkButton>
                <%--<input type="button" id="btnShowInstalledPrinters" value="Show Insalled Printers"
                     önclick="showInstalledPrinters()" />--%>
            </td>
        </tr>
        <tr>
            <td align="center">
                <rsweb:ReportViewer ID="rvReport"  runat="server" Font-Names="Verdana" Font-Size="8pt"
                    Height="100%"  ShowRefreshButton="False" AsyncRendering ="False"
                    SizeToReportContent="True" Visible="True" Width="100%" ZoomMode="PageWidth">
                </rsweb:ReportViewer>
            </td>
        </tr>
    </table>

and this is my ascx.cs code
 #region Properties

        public DataTable MainDataSource
        {
            set
            {
                ViewState["MainDataSource"] = value;

                rvReport.Reset();
                rvReport.LocalReport.DataSources.Clear();
                rvReport.LocalReport.DataSources.Add(new ReportDataSource("Main", value));
            }
            get
            {
                if (ViewState["MainDataSource"] != null)
                {
                    return (DataTable) ViewState["MainDataSource"];
                }
                return null;
            }
        }

        public DataTable HeaderDataSource
        {
            set
            {
                ViewState["HeaderDataSource"] = value;

            }
            get
            {
                if (ViewState["HeaderDataSource"] != null)
                {
                    return (DataTable)ViewState["HeaderDataSource"];
                }
                return null;
            }
        }
        
        public bool ShowInstalledPrinterBtn
        {
            set { lbtnShowInstalledPrinters.Visible = value; }
            get { return lbtnShowInstalledPrinters.Visible; }
        }

        public string rprtEmbeddedResource
        {
            set { ViewState["rprtEmbeddedResource"] = value; }
            get
            {
                if (ViewState["rprtEmbeddedResource"] != null)
                {
                    return ViewState["rprtEmbeddedResource"].ToString();
                }
                return null;
            }
        }

        #endregion Properties

        #region Page Events
   
        protected void Page_Load(object sender, EventArgs e)
        {
            rvReport.LocalReport.ReportPath = Server.MapPath("Reports/FUDSTDTranscriptRPT.rdlc");
            
        }

        #endregion Page Events

        #region Methods

        public void RefreshReport()
        {
            rvReport.Reset();
            rvReport.LocalReport.DataSources.Clear();
            rvReport.LocalReport.ReportPath =  Server.MapPath("Reports/FUDSTDTranscriptRPT.rdlc");
            rvReport.LocalReport.DataSources.Add(new ReportDataSource("Main", MainDataSource));
            rvReport.LocalReport.DataSources.Add(new ReportDataSource("HeaderDS", HeaderDataSource));
            rvReport.Visible = (MainDataSource.Rows.Count != 0 && HeaderDataSource.Rows.Count!=0);
            rvReport.LocalReport.ReportEmbeddedResource = rprtEmbeddedResource;
            rvReport.LocalReport.Refresh();
        }

        public void DisableUnwantedExportFormat(ReportViewer ReportViewerID, string strFormatName)
        {
            FieldInfo info;

            foreach (RenderingExtension extension in ReportViewerID.LocalReport.ListRenderingExtensions())
            {
                if (extension.Name == strFormatName)
                {
                    info = extension.GetType().GetField("m_isVisible", BindingFlags.Instance | BindingFlags.NonPublic);
                    info.SetValue(extension, false);
                }
            }
        }

        #endregion Methods
    }
}