deliver report on website

ZarrinPour

Hi all ,
I'm using Fastreport Studio in Asp.Net v2 Web-Application project . I have Created a simple report and i want to deliver this on my website .
but after creating and passing custom dataset , every thing is ok in Fast-Report Designer BUT after pressing Preview Button nothing will be appeared.

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//select code of fr3 file from data base
SqlConnection con = new SqlConnection(ConStr);
SqlCommand com = new SqlCommand("Select * From My Table", con);
con.Open();
string tt = com.ExecuteScalar().ToString();
//*************************************
// Create report object
frx = new TfrxReportClass();
//*************************************
frx.EngineOptions.SilentMode = frxSilentMode.simSilent;
//**************************************
// Create ADO database object
TfrxADODatabaseClass ado_database = new TfrxADODatabaseClass();
ado_database.ConnectionString ="connection string";
ado_database.LoginPrompt = false;
ado_database.Connected = true;
//**************************************
// Create ADO query object
TfrxADOQueryClass ado_query = new TfrxADOQueryClass();
ado_query.DataBase = ado_database;
ado_query.Name = "db_Qrf533";
ado_query.Query = str_query
//****************************************
frx.SelectDataset(true, ado_query as IfrxDataSet);
MemoryStream m = new MemoryStream(System.Text.Encoding.Default.GetBytes(tt));
frx.LoadReportFromStream(m);
//***************************************
// Disable progress window
frx.ShowProgress = false;
//*****************************************
// For testing I added this line
frx.DesignReport(); // After Executing this line, every thing is ok and design page of Fast-Report Will be
shown successfully, even My above Dataset with its Fields and its data are displayed in [Data]
Page of the Fast-Report BUT When i Press the [PreView] Button , nothing appears !!!!

// Create a memory stream object
ms = new System.IO.MemoryStream();
// Query extended export interface
exports = frx as IfrxBuiltinExportsEx;
// Do export
exports.ExportToHTML(ms, true, true, false, true, true, false);
// Set memory stream position to begin
ms.Position = 0;
// Create tream reader by a memory stream
sr = new System.IO.StreamReader(ms);
// Write result to the user's browser
string TmpStr = sr.ReadToEnd();

Response.Write(TmpStr);
sr = null;
ms = null;
frx.ClearDatasets();

//

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What am i doing wrong here? Could anyone help me please?
Kind Regards.