System.Net.WebProxyScriptHelper.WebProxyScriptHelper.dayOfWeek C# (CSharp) Method

        private static DayOfWeek dayOfWeek(string weekDay)
        {
            if (weekDay!=null && weekDay.Length==3) {
                if (weekDay[0]=='T' || weekDay[0]=='t') {
                    if ((weekDay[1]=='U' || weekDay[1]=='u') && (weekDay[2]=='E' || weekDay[2]=='e')) {
                        return DayOfWeek.Tuesday;
                    }
                    if ((weekDay[1]=='H' || weekDay[1]=='h') && (weekDay[2]=='U' || weekDay[2]=='u')) {
                        return DayOfWeek.Thursday;
                    }
                }
                if (weekDay[0]=='S' || weekDay[0]=='s') {
                    if ((weekDay[1]=='U' || weekDay[1]=='u') && (weekDay[2]=='N' || weekDay[2]=='n')) {
                        return DayOfWeek.Sunday;
                    }
                    if ((weekDay[1]=='A' || weekDay[1]=='a') && (weekDay[2]=='T' || weekDay[2]=='t')) {
                        return DayOfWeek.Saturday;
                    }
                }
                if ((weekDay[0]=='M' || weekDay[0]=='m') && (weekDay[1]=='O' || weekDay[1]=='o') && (weekDay[2]=='N' || weekDay[2]=='n')) {
                    return DayOfWeek.Monday;
                }
                if ((weekDay[0]=='W' || weekDay[0]=='w') && (weekDay[1]=='E' || weekDay[1]=='e') && (weekDay[2]=='D' || weekDay[2]=='d')) {
                    return DayOfWeek.Wednesday;
                }
                if ((weekDay[0]=='F' || weekDay[0]=='f') && (weekDay[1]=='R' || weekDay[1]=='r') && (weekDay[2]=='I' || weekDay[2]=='i')) {
                    return DayOfWeek.Friday;
                }
            }
            return (DayOfWeek)unchecked(-1);
        }