How TTS voice change

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C#3.0

C#

Hi to all gentleman:

i get(LH Michael,Microsoft Mary etc..) voice in comboBox but when I select voice from comboBox it does not change voice.it get the default voice which i choose in windows.when i run the code does not give any error also.
thanks from all .

mycode is:
private void Form1_Load(object sender, EventArgs e)
{
foreach (ISpeechObjectToken token in spvoice.GetVoices(string.Empty, string.Empty))
{
comboBox1.Items.Add(token.GetAttribute("Name"));
}
comboBox1.SelectedIndex = 0;
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
spvoice.Voice = spvoice.GetVoices("Name="+comboBox1.Items[0].ToString(), string.Empty).Item(0);
}