Загрузка изображения на сайт

private void tsbFill_Click(object sender, EventArgs e)
{
    while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
        Application.DoEvents();
 
 
    for (int i = 0; i < countImage; i++)
    {
        _tagImage = "";
        _fileNameImage = fileName;                 
        if (_fileNameImage != "")
        {
            _tagImage = "input_upload_photo_" + (i + 1).ToString();
            Populate().ContinueWith((_) =>
            {
                //...
            }, TaskScheduler.FromCurrentSynchronizationContext());
        }
    }
}
 
async Task PopulateInputFile(HtmlElement file)
{
    file.Focus();
 
    // delay the execution of SendKey to let the Choose File dialog show up
    var sendKeyTask = Task.Delay(1000).ContinueWith((_) =>
    {
        // this gets executed when the dialog is visible
        SendKeys.Send(_fileNameImage + "{ENTER}");
    }, TaskScheduler.FromCurrentSynchronizationContext());
 
    file.InvokeMember("Click"); // this shows up the dialog
 
    await sendKeyTask;
 
    // delay continuation to let the Choose File dialog hide
    await Task.Delay(1000);
}
 
async Task Populate()
{
    var elements = webBrowser1.Document.GetElementsByTagName("input");
    foreach (HtmlElement file in elements)
    {
        if (file.GetAttribute("id") == _tagImage)
        {
            file.Focus();
            await PopulateInputFile(file);
        }
    }
}