HTTP

string url = textBox1.Text.Trim();
if (string.IsNullOrEmpty(url))
{
    MessageBox.Show("Please enter a URL.");
    return;
}

// Save to Documents folder
string localPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + @"\downloaded_file.txt";

try
{
    using (WebClient client = new WebClient())
    {
        client.DownloadFile(url, localPath);
    }

    MessageBox.Show($" File downloaded successfully to:\n{localPath}");
}
catch (Exception ex)
{
    MessageBox.Show(" Error: " + ex.Message);
}