need to change the default decimal separator

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ASP.NET

globalization

I have multilingual asp.net application and currentUICulture is set to pt-PT. problem is by setting the UICulture decimal point (.) changes to comma (,) but my client requires the same decimal point (.) I have tried to override the decimal separator in InitializeCulture event of the page like this

protected override void InitializeCulture()
{
System.Globalization.CultureInfo ci = System.Globalization.CultureInfo.CurrentUICulture;
ci.NumberFormat.NumberDecimalSeparator = ".";
ci.NumberFormat.NumberGroupSeparator = ",";

System.Threading.Thread.CurrentThread.CurrentUICulture = ci;
System.Threading.Thread.CurrentThread.CurrentCulture = ci;

base.InitializeCulture();
}

and when I am binding the texboxes in page_load event the decimal separator remains comma (,) and problem is the InitializeCulture() not forcing the decimal separator to what I have specified

please help.