/// <summary>
/// 向媒体控制接口发送控制命令
/// </summary>
/// <param name="lpszCommand">命令，参见
/// http://msdn.microsoft.com/en-us/library/windows/desktop/dd743572(v=vs.85).aspx </param>
/// <param name="lpszReturnString">命令返回的信息，如果没有需要返回的信息可以为null</param>
/// <param name="cchReturn">指定返回信息的字符串大小</param>
/// <param name="hwndCallback">回调句柄，如果命令参数中没有指定notify标识，可以为new IntPtr(0)</param>
/// <returns>返回命令执行状态的错误代码</returns>
[DllImport("winmm.dll")]
static extern Int32 mciSendString(string lpszCommand, StringBuilder returnString, int bufferSize, IntPtr hwndCallback);
/// <summary>
/// 返回对执行状态错误代码的描述
/// </summary>
/// <param name="errorCode">mciSendCommand或者mciSendString返回的错误代码</param>
/// <param name="errorText">对错误代码的描述字符串</param>
/// <param name="errorTextSize">指定字符串的大小</param>
/// <returns>如果ERROR Code未知，返回false</returns>
[DllImport("winmm.dll")]
static extern bool mciGetErrorString(Int32 errorCode, StringBuilder errorText, Int32 errorTextSize);

int error = mciSendString("open C:\\Users\\Angel\\Desktop\\123.wav alias myDivece", null, 0, new IntPtr(0));
if (error == 0)
{
  mciSendString("play myDivece", null, 0, new IntPtr(0)); //播放
}
else
{
  StringBuilder errorText = new StringBuilder();
  mciGetErrorString(error, errorText, 50);
  MessageBox.Show(errorText.ToString());
}

mciSendString("play myDivece", null, 0, new IntPtr(0)); //播放
mciSendString("pause myDivece", null, 0, new IntPtr(0)); //暂停
mciSendString("stop myDivece", null, 0, new IntPtr(0)); //停止
mciSendString("close myDivece", null, 0, new IntPtr(0)); //关闭