Single control for open and save file in windows / WPF

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WPF

C#6.0

Assuming there will be only one (.log) file
Say if user selects the path ex:(c:\test) and if the .log file exist then it should return c:\test\xyz.log.

if file not exist then in the same control user should specify the file name and it should be saved in the path in .log extension.


Any help?

What I have tried:

Below is the code :

string logFileName = string.Empty;
            FolderBrowserDialog fbd = new FolderBrowserDialog();

            if (fbd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                logFileName = CheckLogFile(fbd.SelectedPath);
            else
                return;

            if (!string.IsNullOrEmpty(logFileName))
                LogFileName = Path.Combine(fbd.SelectedPath, logFileName);
            else
            {
                Microsoft.Win32.SaveFileDialog sfd = new Microsoft.Win32.SaveFileDialog();
                if (sfd.ShowDialog() == true)
                {
                    LogFileName = sfd.FileName;
                }
            }