You can learn how to get a file by using a file picker in Open files and folders with a picker. Know how to get the file that you want to read from, write to, or both To learn how to write asynchronous apps in C++/CX, see Asynchronous programming in C++/CX. To learn how to write asynchronous apps in C++/WinRT, see Concurrency and asynchronous operations with C++/WinRT. You can learn how to write asynchronous apps in C# or Visual Basic, see Call asynchronous APIs in C# or Visual Basic. Understand async programming for Universal Windows Platform (UWP) apps
For a complete sample, see the File access sample.
