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will this post help?

Excuse me?

I need send data to database only when there is signal WiFi.

For this I need to validate the signal.

Additionally to Luke recommendation, let me bring to your attention that the .NET WlanEx demo that comes with our Mobile Devices SDK illustrates how to retrieve the RSSI info

E.g.

private void statsRefreshControl_Click(object sender, EventArgs e)
 {
     statsControl.Items.Clear();
     NdisInterface.ConnectionStatistics stats;
     try
     {
      stats = supplicant.GetConnectionStatistics();
     }
    catch
    {
      statsControl.Items.Add("Not Available");
      return;
    }
    if (stats.ConnectState == NdisInterface.MediaState.disconnected)
    {
      statsControl.Items.Add("Disconnected");
      return;
    }
    // ok, we've got something to report
    statsControl.Items.Add("RSSI: " + stats.Rssi);
    statsControl.Items.Add("Packets In: " + stats.PacketsIn);
    statsControl.Items.Add("Packets Out: " + stats.PacketsOut);
    uint errors = stats.InErrors + stats.OutErrors;
    statsControl.Items.Add("Errors: " + errors);
    // add more stats here if you like...
}

Regards,
Jacques