问OpenFileDialog --如何防止默认目录被覆盖？

EN

using (OpenFileDialog openFile = new OpenFileDialog())
{
    // Example: This opens in the 'Desktop' directory
    // User navigates to 'Documents' directory in the Form before selecting a file
    DialogResult result = openFile.ShowDialog();
    if (result == DialogResult.OK) MessageBox.Show(openFile.FileName);
}

// Somewhere else, this code then runs
using (OpenFileDialog openFile = new OpenFileDialog())
{
    // Problem: This now opens in 'Documents' directory. Not good!
    // How to open using the same default directory (ie: Desktop)?
    DialogResult result = openFile.ShowDialog();
    if (result == DialogResult.OK) MessageBox.Show(openFile.FileName);
}