How to show from capital letter to Normal letter on asp.net

string strTest = "HELLO THIS IS FOR TEST";
            string strTestLower = strTest.ToLower();
            System.Globalization.CultureInfo cultureInfo = System.Threading.Thread.CurrentThread.CurrentCulture;
            System.Globalization.TextInfo textInfo = cultureInfo.TextInfo;
            string MyText = textInfo.ToTitleCase(strTestLower);

Private Function ConvertToTitlelCase(ByVal phrase As String) As String
        Dim splittedPhrase() As String = phrase.Split(Microsoft.VisualBasic.ChrW(32), Microsoft.VisualBasic.ChrW(45), Microsoft.VisualBasic.ChrW(46))
        Dim sb As var = New StringBuilder
        'sb.Append(splittedPhrase[0].ToLower());
        'splittedPhrase[0] = string.Empty;
        For Each s As String In splittedPhrase
            Dim splittedPhraseChars() As Char = s.ToCharArray
            If (splittedPhraseChars.Length > 0) Then
                splittedPhraseChars(0) = New String(splittedPhraseChars(0), 1).ToUpper.ToCharArray(0)
            End If
            sb.Append(New String(splittedPhraseChars))
        Next
        Return sb.ToString
    End Function