Unable to get the Content of the text file saved in the Database(My-Sql)

I have written the following code to insert a text file and get data from My-Sql but i am not getting the required output.

I created my table as follows

ID int AutoIncrement
Fname varchar
FData LongBlob

My code

string filePath = Server.MapPath("AchTemplates/genACH.txt"); 
        string filename = Path.GetFileName(filePath); 
        FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read); 
        BinaryReader br = new BinaryReader(fs); 
        Byte[] bytes = br.ReadBytes((Int32)fs.Length); 
        br.Close(); 
        fs.Close(); 
        string strQuery = "insert into tblFiles(FName,FData) values (@_FName, @_FData)"; 
        MySqlCommand cmd = new MySqlCommand(strQuery); 
        cmd.Parameters.Add("@_FName", MySqlDbType.VarChar).Value = filename; 
        cmd.Parameters.Add("@_FData", MySqlDbType.LongBlob).Value = bytes; 
        InsertUpdateData(cmd); 
        // To get the data i used the following code 
        private void download(DataTable dt) 
        { 
            Byte[] bytes = (Byte[])dt.Rows[0]["FData"]; 
            //byte[] bytes = Encoding.UTF8.GetBytes(Convert.ToChar(dt.Rows[0]["FData"])); 
            Response.Buffer = true; 
            Response.Charset = ""; 
            Response.Cache.SetCacheability(HttpCacheability.NoCache); 
            //Response.ContentType = dt.Rows[0]["ContentType"].ToString(); 
            Response.AddHeader("content-disposition", "attachment;filename=" + dt.Rows[0]["FName"].ToString()); 
            Response.BinaryWrite(bytes); 
            Response.Flush(); 
            Response.End(); 
        }  

So can any one tell what's wrong going