String was not recognized as a valid DateTime

I have the following code and get an error:
String was not recognized as a valid DateTime
DateTime strResult = DateTime.ParseExact(dateString, oldFormat, provider);
I am trying to produce today's date in format day-month-year.
Thanks in advance for any help given.
var result = "";
    if (IsPost)
    {
        var firstName = Request["FirstName"];
        var lastName = Request["LastName"];
        var email = Request["Email"];
        var userData = firstName + "," + lastName +
            "," + email + Environment.NewLine;
        var dataFile = Server.MapPath("~/App_Data/data" + @Session["CustId"] + ".txt");
        //File.AppendAllText(@dataFile, userData);
        File.WriteAllText(@dataFile, userData);
        System.Globalization.CultureInfo provider = System.Globalization.CultureInfo.CreateSpecificCulture("en-UK");
        string dateString = DateTime.Today.ToString();
        string oldFormat = "ddmmyy";
        DateTime strResult = DateTime.ParseExact(dateString, oldFormat, provider);
        result = "Information saved on " + strResult + "#";
    }

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homeshopperAsked:
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louisfrConnect With a Mentor Commented:
You're trying to display the date in a given format?
ParseExact does the opposite operation : convert a text representing a date in a given format to a datetime value.

Try this:
string dateString = DateTime.Today.ToString("ddMMyy);
result = "Information saved on " + dateString + "#";

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Ramkisan JagtapLead DeveloperCommented:
Use this code sample and change you code accordingly:

Dim dtfi As New DateTimeFormatInfo()
dtfi.ShortDatePattern = "dd/MM/yyyy"
dtfi.DateSeparator = "/"
Dim strResult = Convert.ToDateTime(dateString, dtfi)
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Ramkisan JagtapLead DeveloperCommented:
If you still get the same error try changing line 13 as below:

string dateString = DateTime.Today.ToShortDateString();
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homeshopperAuthor Commented:
Thankyou for your suggestions.
The following worked:
string dateString = DateTime.Today.ToString("dd-MM-yy");
result = "Information saved on " + dateString + "#";

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The following code gives same error:
System.Globalization.CultureInfo provider = System.Globalization.CultureInfo.CreateSpecificCulture("en-UK");
        string dateString = DateTime.Today.ToShortDateString();
        string oldFormat = "ddmmyy";
        DateTime strResult = DateTime.ParseExact(dateString, oldFormat, provider);
        result = "Information saved on " + strResult + "#";

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Thanks for the help given.
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