Connecting multiple stores

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C#

Oracle

Hi all,
in my application i need to connect to about 50 databases and copy some data but while connecting my application got stuck in between on any database while opening connection for hours till i terminate it even after giving connection timeout

foreach (DataRow row in dt.Rows)
 {
    try
      {
//first i am pinging the IP if it replies then i am proceeding
         System.Net.NetworkInformation.Ping objping = new System.Net.NetworkInformation.Ping();
         if (objping.Send(row["FTP_IP"].ToString()).Status == System.Net.NetworkInformation.IPStatus.Success)
 {
                            
     constr = @"Data Source=10.**.**.**/orcl;User                      ID=*****;Password=****;ConnectionLifetime=60;Connection Timeout=30;Timeout=30;";
                            store_con = new OracleConnection(constr);  
// i tried this using thread but its not working                          
                            //Thread workerThread = new Thread(DoWork);
                            //workerThread.Start();
                            //Thread.Sleep(5000);
                            //workerThread.Join();
                            store_con.Open();//here its getting stuck no error nothing 

so is there any other way to overcome this situation like using thread or backgroundworker
i want it should try only for 5 seconds at max.
i don't want the thread to wait for 5 seconds for every connection...because most of them got connected within 1 or 2 seconds