using c# how travel string to datetime

thanks Beyong!
problem had solve, code is

string str = "07-12-12 09:40AM";
IFormatProvider culture = new CultureInfo("en-us", false);
DateTime dt = DateTime.Parse(str, culture);

private string GetDateResult()
{
string dateString = "07-12-13 09:40AM";
string strResult = "";

DateTime dateResult;
CultureInfo culture = CultureInfo.CreateSpecificCulture("en-US");
DateTimeStyles styles = DateTimeStyles.None;
if (DateTime.TryParse(dateString, culture, styles, out dateResult))
strResult = dateResult.ToString("yy-MM-dd");

return strResult;
}

Use this function pls.Maybe could help you.