Why program working differently on every run when using async

Question

So I have an application that uses SMB to move files within an Azure fileshare. The problem is that every time I implement a programme, I get different outcomes. I've seen that some files are being destroyed from their original locations while others are not being copied. It is working fine while I am debugging code step by step. Perhaps it's because my code is performed before my async task is completed. Here's a sample of the code I wrote:

public static class SMB
{

     public static async Task MoveFile()
    {
    ....
        await CreateNestedDirectoryIfNotExistsAsync();
    ....
    }
    private static async Task CreateNestedDirectoryIfNotExistsAsync()
    {
    ....
    }

}

I'm utilising the aforementioned code in my console application project by including the class in my reference, and then using the methods as follows:

public static class SMB
{

     public static async Task MoveFile()
    {
    ....
        await CreateNestedDirectoryIfNotExistsAsync();
    ....
    }
    private static async Task CreateNestedDirectoryIfNotExistsAsync()
    {
    ....
    }

}

Answer 1

You can use the async Main method from c# 7.1 onward but you have to enable the 7.1 features in VS 2017.

Still, if you want to use the synchronous Main method and keep your code, you simply should modify

UseMethodOfDifferentProject().getAwaiter()

to

UseMethodOfDifferentProject().GetAwaiter().GetResult();

GetWaiter() does not return the asynchronous operation's result; GetResult() does. Essentially, the software exits without waiting for the asynchronous process to complete. I can see how this will wind up being a terrible disaster.