Get next Sunday date based on Current date in C# and VB.Net

Please refer below code

C#

public DateTime Next(DateTime from, DayOfWeek dayOfWeek)
{
    int start = (int)from.DayOfWeek;
    int target = (int)dayOfWeek;
    if (target <= start)
        target += 7;
    return from.AddDays(target - start);
}

Or

var date = DateTime.Now;
var nextSunday = date.AddDays(7 - (int)date.DayOfWeek);

VB

Public Function [Next](from As DateTime, dayOfWeek As DayOfWeek) As DateTime
    Dim start As Integer = CInt(from.DayOfWeek)
    Dim target As Integer = CInt(dayOfWeek)
    If target <= start Then
        target += 7
    End If
    Return from.AddDays(target - start)
End Function

Or

Dim [date] = DateTime.Now
Dim nextSunday = [date].AddDays(7 - CInt([date].DayOfWeek))

I hope this will help you out.