Example for using bmp180-dotnet Library
var temperature = bmp180.ReadTemperature();
var pressure = bmp180.ReadPressure();
var altitude = bmp180.ReadAltitude();
var p0 = bmp180.ReadSeaAltitude();
Console.WriteLine("Temperature {0}.{1} *C", temperature / 10, temperature % 10);
Console.WriteLine("Pressure {0} Bar", pressure);
Console.WriteLine("Altitude {0:0.##} mts", altitude);
Console.WriteLine("Sealevel Pressure {0} Pa", p0);