Exisiting project C# Serialport write/read asynchronously

I'm currently developing a WPF project in Visual Studio 2017 in C#, I need help to implement in the correct way the serialpor t([login to view URL];) read/write into a gps device, at this moment is working in someway but I need to fix some bugs and develop some improvements! (work asynchronously to have a better UI experience while the write and read task are executing) So I need a programmer with a good experience in C# with threads, and background workers, I think is not complicated if the programmer have good experience with serialport implementations! Thanks in advance