Title case in asp.net

hi friends,
i want the string in Tital case. I achive this by using this code.
CultureInfo cultureInfo = Thread.CurrentThread.CurrentCulture;
TextInfo textInfo = cultureInfo.TextInfo;
string studentName = textInfo.ToTitleCase(txtName.Text.Trim());
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Input string:- my NAME is manoj.
present o/p:- My NAME Is Manoj.
Requirment o/p:- My Name is Manoj.

Plz help me to achive the requirment o/p.
Thanks!