[c#] How to get the day name from a selected date?

I have this : Datetime.Now(); or 23/10/2009
I want this : Friday

For local date-time (GMT-5) and using Gregorian calendar.

(DateTime.Parse((Eval("date").ToString()))).DayOfWeek.ToString()

at the place of Eval("date"),you can use any date...get name of day

What about if we use String.Format here

DateTime today = DateTime.Today;_x000D_
String.Format("{0:dd-MM}, {1:dddd}", today, today) //In dd-MM format_x000D_
String.Format("{0:MM-dd}, {1:dddd}", today, today) //In MM-dd format

DateTime now = DateTime.Now
string s = now.DayOfWeek.ToString();

System.Threading.Thread.CurrentThread.CurrentUICulture.DateTimeFormat.GetDayName(System.DateTime.Now.DayOfWeek)

or

System.Threading.Thread.CurrentThread.CurrentUICulture.DateTimeFormat.GetDayName(DateTime.Parse("23/10/2009").DayOfWeek)

try this:

DateTime.Now.DayOfWeek

You're looking for the DayOfWeek property.

Here's the msdn article.

If you want to know the day of the week for your code to do something with it, DateTime.Now.DayOfWeek will do the job.

If you want to display the day of week to the user, DateTime.Now.ToString("dddd") will give you the localized day name, according to the current culture (MSDN info on the "dddd" format string).

DateTime.Now.DayOfWeek quite easy to guess actually.

for any given date:

   DateTime dt = //....
   DayOfWeek dow = dt.DayOfWeek; //enum
   string str = dow.ToString(); //string

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace GuessTheDay
{
class Program
{
    static void Main(string[] args)
    { 
 Console.WriteLine("Enter the Day Number ");
 int day = int.Parse(Console.ReadLine());
 Console.WriteLine(" Enter The Month");
int month = int.Parse(Console.ReadLine());
Console.WriteLine("Enter Year ");
int year = int.Parse(Console.ReadLine());
DateTime mydate = new DateTime(year,month,day);
string formatteddate = string.Format("{0:dddd}", mydate);
Console.WriteLine("The day should be " + formatteddate);
}  
 } 
   }

I use this Extension Method:

public static string GetDayName(this DateTime date)
{
    string _ret = string.Empty; //Only for .NET Framework 4++
    var culture = new System.Globalization.CultureInfo("es-419"); //<- 'es-419' = Spanish (Latin America), 'en-US' = English (United States)
    _ret = culture.DateTimeFormat.GetDayName(date.DayOfWeek); //<- Get the Name     
    _ret = culture.TextInfo.ToTitleCase(_ret.ToLower()); //<- Convert to Capital title
    return _ret;
}