private void timerReadCyc_Tick(object sender, EventArgs e)
{
    for (g_read_idx = 0; g_read_idx < read_reg_list.Length; g_read_idx++)
    {
          udpNetwork.ReadRegValue(read_reg_list[g_read_idx]);   //посылка по UDP
                      
    }              
}

public void updateRegReadValue(int Regvalue)
{
    Invoke((MethodInvoker)delegate ()
    {    
            listViewRead.Items[g_read_idx].SubItems[1].Text = Regvalue.ToString("X");
    });
}

 private void PopulateReadListView()
{
    int i;

    listViewRead.Items.Clear();

    for (i = 0; i < read_reg_list.Length; i++)
    {
         string[] row = { read_reg_list[i], " " };
         ListViewItem item = new ListViewItem(row);
         listViewRead.Items.Add(item);
   }
}

public void updateRegReadValue(int Regvalue)
{
    Invoke((MethodInvoker)delegate ()
    { 
           if (g_read_idx < read_reg_list.Length )
                listViewRead.Items[g_read_idx].SubItems[1].Text = Regvalue.ToString("X");
    });
}

private void timerReadCyc_Tick(object sender, EventArgs e)
{
    for (g_read_idx = 0; g_read_idx < read_reg_list.Length; g_read_idx++)
    {
          udpNetwork.ReadRegValue(read_reg_list[g_read_idx]);   //посылка по UDP
          
          while (response == 0)
         {
              timeout++;
              Thread.Sleep(1);
              
             if (timeout > 100) break;
         } 

       response = 0;
                      
    }              
}

public void updateRegReadValue(int Regvalue)
{
    Invoke((MethodInvoker)delegate ()
    {    
           response = 1;
           listViewRead.Items[g_read_idx].SubItems[1].Text = Regvalue.ToString("X");
    });
}

udpNetwork.ReadRegValue("аааа");

public void updateRegReadValue(int Regvalue)
{
    Invoke((MethodInvoker)delegate ()
    {    
           response = 1;
           listViewRead.Items[0].SubItems[1].Text = Regvalue.ToString("X");
    });
}

private void timerReadCyc_Tick(object sender, EventArgs e)
{
    for (g_read_idx = 0; g_read_idx < read_reg_list.Length; g_read_idx++)
    {
          udpNetwork.ReadRegValue(read_reg_list[g_read_idx]);   //посылка по UDP            
    }              
}

 public void rxing()
 {
     while (Global_Parameter.UDP_NETWORK_FLAG)
     {
          try
          {
               rxSize = rxSock.Receive(rxBuffer);
               if (rxSize > 0)
               {
                   udpRXData(rxBuffer, rxSize);
                   rxSize = 0;
               }
          }
          catch (Exception ex)
          {
               if (ex.HResult == (double)0x80131530 || ex.HResult == (double)0x800040050)
                   MessageBox.Show(ex.ToString());
          }
    }
}

private void udpRXData(byte[] rcvUdpData, int rcvSize)      
{
    UInt32 opCode = BitConverter.ToUInt32(rcvUdpData, 0);
    switch (opCode)
    {
         case R_REG_Receive:
          {
              main.updateRegReadValue(BitConverter.ToInt32(rcvUdpData, 4));
              break;
         }
    }
}