get return value of an async method without using task in csharp

To get the return value of an async method in C# without using Task, you can use the ValueTask type.

The ValueTask<TResult> type is similar to Task<TResult> but it optimizes for the case where the operation has already completed by avoiding allocation of a state machine.

Here is an example of how to use ValueTask to get the return value of an async method:

main.cs
async ValueTask<int> GetResultAsync()
{
    // simulate asynchronous operation
    await Task.Delay(1000);

    return 42;
}

async void MyMethodAsync()
{
    // call GetResultAsync and get the return value
    int result = await GetResultAsync();

    // use the return value
    Console.WriteLine(result);
}
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In this example, GetResultAsync is an asynchronous method that returns an int. The MyMethodAsync method calls GetResultAsync and uses the await keyword to asynchronously wait for the method to complete and return the result.