Here is a quick way to get the first day of the current week.

If you are happy with sunday as the first day of the week, then you can simply do this :

 public static DateTime FirstDayOfWeek(this DateTime date)
 {
            return DateTime.Today.AddDays(-(int)DateTime.Today.DayOfWeek);
 }

But if you want that the first day of the week matches your culture (eg: the belgian week starts on monday), you have to take care of the culture’s DateTime format.

So the method will change a bit :

public static DateTime FirstDayOfWeek(this DateTime date)
{
     return DateTime.Today.AddDays(-((int)DateTime.Today.DayOfWeek - (int)CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek));
}

Usage :

    DateTime FirstDayOfWeek = DateTime.Today.FirstDayOfWeek();

or

 DateTime FirstDayOfWeek = DateTime.Now.FirstDayOfWeek();

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