C# - Can you run a task and return to the main thread later?

Question

in the case the whole program is written without task and only one excerpt is with task, I wanted after that piece it returned to the "main thread". The code below is inside a for, and serves to open a save window, the task specifically operates this window, it starts even before the window is opened because when it opens the program "stops reading the code". Remember that the save window is not a savefileDialog, it is opened using the webbrowser tool of c# calling a click on a download button.

Clipboard.SetText(@"C:\ARQUIVOS\");

            Task t = Task.Factory.StartNew(() =>
            {
                Thread.Sleep(5000);
                SendKeys.SendWait("{HOME}");
                SendKeys.SendWait("^{V}");
                Thread.Sleep(1000);
                SendKeys.SendWait("{ENTER}"); //esse enter salva o arquivo, depois disso o programa fica em "standby" pois acaba a thread e nao volta para o codigo principal 
                Task.Delay(3000);

            });

            await Task.Delay(3000);

            SendKeys.SendWait("{TAB}");
            SendKeys.SendWait("{TAB}");
            SendKeys.SendWait("{TAB}");
            SendKeys.SendWait("{ENTER}");  //abre janela de salvar
            FileIOPermission.RevertAll();  //permissões para a janela
            Task.Delay(3000);

EDIT: I got it with the following code:

    private async Task OperaJanelaSaveAs()
    {
        Clipboard.SetText(@"C:\ARQUIVOS\");

        SendKeys.SendWait("{TAB}");
        SendKeys.SendWait("{TAB}");
        SendKeys.SendWait("{TAB}");
        SendKeys.SendWait("{ENTER}");  //abre janela de salvar
        await Task.Delay(4000);
        SendKeys.SendWait("{HOME}");
        SendKeys.SendWait("^{V}");    //cola o caminho do arquivo (clipboard) 
        await Task.Delay(3000);
        SendKeys.SendWait("{ENTER}"); //salva o arquivo
        await Task.Delay(4000);
    }

and calling the delay function to wait for the click on the download button and await

await Task.Delay(6000);
await OperaJanelaSaveAs();

Answer 1

Look... is very confused your question but the information I was able to extract follows: This if you have available . NET Framework 4.0+

public async Task DoWork()
{
    Clipboard.SetText(@"\\192.168.30.158\ARQUIVOS\");

    await Task.Run(async () =>
    {
        await Task.Delay(5000);
        SendKeys.SendWait("{HOME}");
        SendKeys.SendWait("^{V}");
        await Task.Delay(1000);
        SendKeys.SendWait("{ENTER}"); //esse enter salva o arquivo, depois disso o programa fica em "standby" pois acaba a thread e nao volta para o codigo principal 
        await Task.Delay(3000);
    });

    await Task.Delay(3000);

    SendKeys.SendWait("{TAB}");
    SendKeys.SendWait("{TAB}");
    SendKeys.SendWait("{TAB}");
    SendKeys.SendWait("{ENTER}");  //abre janela de salvar

    FileIOPermission.RevertAll();  //permissões para a janela

    await Task.Delay(3000);
}

Answer 2

See an example to save file back to the main system stream after thread execution.

With some modifications you can adapt to your scenario.

public void SalvarArquivo()
{
    //faz as ações antes de salvar o arquivo
    Console.WriteLine("Preparando arquivo para salvar");

    var task = Task.Factory.StartNew(() =>
    {
        for (var i = 10; i >= 0; i--)
        {
            Console.Write("\rSalvando arquivo. Aguarde {0} segundos", i);
            Thread.Sleep(1000);
        }
        Console.WriteLine();
    });

    task.Wait();

    //faz as ações após conclusão
    Console.WriteLine("Arquivo salvo com sucesso.\nPressione Enter para sair.");
    Console.ReadLine();
}

or

async void Do()
{
    await SalvarArquivoAsync();
}

public async Task SalvarArquivoAsync()
{
    //faz as ações antes de salvar o arquivo
    Console.WriteLine("Preparando arquivo para salvar");

    await Task.Factory.StartNew(() =>
    {
        for (var i = 10; i >= 0; i--)
        {
            Console.Write("\rSalvando arquivo. Aguarde {0} segundos", i);
            Thread.Sleep(1000);
        }
        Console.WriteLine();
    });

    //faz as ações após conclusão
    Console.WriteLine("Arquivo salvo com sucesso.\nPressione Enter para sair.");
    Console.ReadLine();
}