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SpeechSynthesizer demo

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="Speech Synthesis" Height="300" Width="300"     >     <Grid>              </Grid> </Window> //File:Window.xaml.cs using System; using System.Speech.Synthesis; namespace WpfApplication1 {     public partial class Window1 : System.Windows.Window     {         public Window1()         {             InitializeComponent();             SpeechSynthesizer synthesizer = new SpeechSynthesizer();             PromptBuilder promptBuilder = new PromptBuilder();             promptBuilder.AppendTextWithHint("WPF", SayAs.SpellOut);             promptBuilder.AppendText("sounds better than WPF.");             // Pause for 2 seconds             promptBuilder.AppendBreak(new TimeSpan(0, 0, 2));                          promptBuilder.AppendText("The time is");             promptBuilder.AppendTextWithHint(DateTime.Now.ToString("hh:mm"), SayAs.Time);                          promptBuilder.StartVoice("this is a test");             promptBuilder.AppendTextWithHint("queue", SayAs.SpellOut);             promptBuilder.EndVoice();                          promptBuilder.AppendText("Do it faster!");                          promptBuilder.StartVoice("Hi");             promptBuilder.StartStyle(new PromptStyle(PromptRate.ExtraFast));             promptBuilder.AppendTextWithHint("queue", SayAs.SpellOut);             promptBuilder.EndStyle();             promptBuilder.EndVoice();               synthesizer.SpeakAsync(promptBuilder);         }     } }