OpenFileDialog default path

Question

using (var openFileDialog1 = new OpenFileDialog())
        {
            openFileDialog1.Reset();
            if (!string.IsNullOrEmpty(ExcelFilePath))
            {         


        

Answer 1

Where is the last used directory saved?

It is stored in the registry. The exact location depends on the Windows version, for Win7 it is HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32. A quick look with regedit ought to convince you that you don't want to mess with that.

The simple workaround is to provide a valid path. If the one you calculate isn't valid, Directory.Exists returns false, then provide a valid one. Like the Documents folder returned by Environment.GetFolderPath(). Then again, nothing wrong with the last used one either, the user will easily recognize it with good odds that it happens to be close to the desired one.