DateTime TryParse problem

string date = txtWorkingDate.Text;
            DateTime dateTime = DateTime.MinValue;

            if (DateTime.TryParse(date, out dateTime))
            {
               开发者_如何学JAVA args.IsValid = true;
            }
            else
                args.IsValid = false;

txtWorkingDate.Text is like "dd.MM.yyyy" becouse of this validateion is always false if date is not like "dd.MM.yyyy". How c an i check types of date like "dd.MM.yyyy", "MM/dd/yyyy" becouse are all valid.

By using this overload and providing the accepted formats:

string date = txtWorkingDate.Text;
DateTime dateTime;
string[] formats = new[] { "dd.MM.yyyy", "MM/dd/yyyy" };
if (DateTime.TryParseExact(date, formats, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime))
{
    args.IsValid = true;
}
else
{
    args.IsValid = false;
}

System.Globalization.CultureInfo cultureinfo =  
        new System.Globalization.CultureInfo("en-gb"); 
    DateTime dt = DateTime.Parse("13/12/2009", cultureinfo); 

You need to specify the culture assuming you know it.

You can use the

DateTime.TryParse(
    string s,
    IFormatProvider provider,
    DateTimeStyles styles,
    out DateTime result
)

overload.

Also, you don't need the if, you can simply write

args.IsValid = DateTime.TryParse(...);

As DateTime.TryParse() already returns a bool.