C#-How to check if a string contains a date

Boolean hasDate = false;
DateTime dateTime = new DateTime();
String[] inputText = txtWords.Text().Split( " " );//split on a whitespace

foreach( String text in inputText )
{
   //Use the Parse() method
   try
   {
      dateTime = DateTime.Parse( text );
      hasDate = true;
      break;//no need to execute/loop further if you have your date
   }
   catch( Exception ex )
   {
      
   }
}

//after breaking from the foreach loop, you can check if hasDate=true
//if it is, then your user entered a date and you can retrieve it from the dateTime 

if( hasDate )
{
    //user entered a date, get it from dateTime
}
else
{
   //user didn't enter any date
}

Regex stringDatePattern=new Regex("*[0-9][0-9][/][0-9][0-9][/][0-9][0-9[0-9][0-9]]*");
return stringDatePattern.IsMatch(TextBox.Text);

string []format = new string []{"yyyy-MM-dd HH:mm:ss"};
string value = "2011-09-02 15:30:20";
DateTime datetime;

if (DateTime.TryParseExact(value, format, System.Globalization.CultureInfo.InvariantCulture,System.Globalization.DateTimeStyles.NoCurrentDateDefault  , out datetime))
   Console.WriteLine("Valid  : " + datetime);
else
  Console.WriteLine("Invalid");

public static bool IsDate(Object obj)
    {
        string strDate = obj.ToString();
        try
        {
            DateTime dt = DateTime.Parse(strDate);
            if (dt != DateTime.MinValue && dt != DateTime.MaxValue)
                return true;
            return false;
        }
        catch (Exception ex)
        {
            throw ex;
            return false;
        }
    }

try
{
DateTime UserDate=Convert.ToDateTime("MM/dd/yyyy")
}
catch(Exception ex)
{
return "invalid date entered";
}


if(UserDate.Day==11 && UserDate.Day==12)
return true;
else
return false; 

/*
 * Created by Perić Željko
 * IDE SharpDevelop C#
 * Date: 6.12.2011
 * Time: 18:30
 * 
 * This is a small console application that partially solves the problem
 * because it recognizes only the date format in the text
 * that is set at the level of operating system , regional settings
 * in my case it is "Serbian cyrillic" and that means
 * DD.MM.YYYY or DD/MM/YYYY (day/month/year) if you want that program 
 * recognizes the other Date formats such as :
 * MM/DD/YYYY or other,
 * you have to write different kind of program
 * or you have to set regional settings for that Date format
 */
 
using System;
namespace DateCheck
{
	class Program
	{
		public static void Main(string[] args)
		{
			
			//
			// variable definition
			//
			
			string text = "";
			string date = "";
			int lenght = 0;
			int index = 0;
			bool da = false;
			DateTime D;
			
			//
			// write message for user to enter text
			// and read text from console
			//
			Console.WriteLine();
			Console.WriteLine("Hello,");
			Console.WriteLine("Enter text :");
			text = Console.ReadLine();
			
			//
			// wanted format of date is exactly DD/MM/YYYY or DD.MM.YYYY
			// it depends of local Date and Time format settings
			//
			index = 0;
			lenght = 0;
			lenght = text.Length - 9;
			while (index < lenght)
			{
				//
				// Since the format of date consists of 10 characters
				// we take first 10 characters and check if it is Date
				// if it is not we take next 10, starting from 2. character in the text
				// afther that next 10 starting from 3. character in the text ....
				// until we check all text.
				//
				date = text.Substring(index,10);
				try
				{
					D = DateTime.Parse(date);
					da = true;
					index = lenght;
				}
				catch
				{
					da = false;
					index = index + 1;
				}
			}
			
			//
			// If there is Date in the text write a message to user
			//
			if (da == true) 
			{
				Console.WriteLine();
				Console.WriteLine("In the text you have Date !");
			}
			Console.Write("Press any key to continue . . . ");
			Console.ReadKey(true);
		}
	}
}