Speechsynthesizer and speechrecognition using ASP.NET C#

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C#

ASP.NET

speech

recognition

Am enhancing an existing web application (Psychometric Test battery;using Asp.Net,C#,SqlServer)which is already being used by normal users as all of us; now we are enhancing the same for visually impaired persons

So I am thinking to implement this speech recognition in that with existing grid view; but am struggling with that;

In the existing one we have used gridview to load the data from db,now I can't able to read the record one by one using SpeechSynthesizer; It's keep on reading till end of  all the records. 

Here the code:

 <pre lang="c#">
SpeechSynthesizer sp1 = new SpeechSynthesizer();
 protected void btn_Spk_Click(object sender, EventArgs e)
    {
        foreach (GridViewRow row in gvtemperament.Rows)
        {
            Label lbl1 = (Label)row.FindControl("lbl_desc");
            sp1.SelectVoiceByHints(VoiceGender.Male);
            sp1.Volume = 100;
            sp1.Rate = -3;
            sp1.SpeakAsync(lbl1.Text);
            Thread.Sleep(1500);
        }
    }

Can anyone please help me out on this?

And also I need to implement SpeechRecognition to make the system more flexible as a one to one conversation.

Regards,
Narendran Namachivayam.

What I have tried:

In the existing one we have used gridview to load the data from db,now I can't able to read the record one by one using SpeechSynthesizer; It's keep on reading till end of all the records.