how to save recorded sound in C# with save dialog box

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VS2008

C#

Visual-Studio

WPF

i have done sound recording in C# it also save the recorded sound but at fixed location..
i want to provide save dialog box to save that file..how to do..please help me..thanks..i am posting my code here..

private void savestopbutton_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text = "";
            DispatcherTimer dispatcherTimer = new DispatcherTimer();
            dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
            dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);

            interval = new TimeSpan(0, 0, 0);
            dispatcherTimer.Interval = interval;
            dispatcherTimer.Stop();
            mciSendString("save recsound d:\\WPF\\record.wma", "", 0, 0);
            mciSendString("close recsound ", "", 0, 0);
            Computer c = new Computer();
            c.Audio.Stop();

         
        }