Checking valid Date.

protected bool Is_Valid_Date(String date)
{
   try
   {
        DateTime dt = DateTime.Parse(date);
        return true;
   }
   catch
   {
        return false;
   }
}

In above code,if valid date is passed then DateTime.Parse will parse date and cursor will move to the next line and return true.If we pass any wrong date or pass integer value or string value,then DateTime.Par se will throw an error and will go in a catch block.

protected bool Is_Valid_Date(String date)
{
      DateTime dateTime;
     if (DateTime.TryParse(date, out dateTime))
	{
	    return true; // Parsed DateTime Value can be accessed here in dateTime 
	}else{
            return false;
          }
}