c# When to pass false to ConfigureAwait function ?

Question

1) what ConfigureAwait function does ? and when to use it?

async Task<int> GetPageCountAsync()  
{  
    //not shown is how to set up your connection and command  
    //nor disposing resources  
    //nor validating the scalar value  
    var pages = await command.ExecuteScalarAsync().ConfigureAwait(false);  
    return (int)pages;  
}  

Please guide me when i should pass false and when i should not pass false to ConfigureAwait function ?

2) async and await is IO bound job or CPU bound job ? how do i understand it?

Thanks

Answer 1

See the following blogs. It has to do with using the SynchronizationContext or not.

https://devblogs.microsoft.com/dotnet/configureawait-faq/
https://blog.stephencleary.com/2017/03/aspnetcore-synchronization-context.html
Parallel Computing - It's All About the SynchronizationContext