/// <summary>  
/// 判断两个日期是否在同一周  
/// </summary>  
/// <param name="dtmS">开始日期</param>  
/// <param name="dtmE">结束日期</param> 
/// <returns></returns>  
private bool IsInSameWeek(DateTime dtmS, DateTime dtmE) 
    TimeSpan ts = dtmE - dtmS; 
    double dbl = ts.TotalDays; 
    int intDow = Convert.ToInt32(dtmE.DayOfWeek); 
    if (intDow == 0) intDow = 7; 
    if (dbl >= 7 || dbl >= intDow) return false
    else return true
}

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/// <summary> 
/// 某日期是本月的第几周 
/// </summary> 
/// <param name="dtSel"></param> 
/// <param name="sundayStart"></param> 
/// <returns></returns> 
private int WeekOfMonth(DateTime dtSel, bool sundayStart) 
    //如果要判断的日期为1号,则肯定是第一周了  
    if (dtSel.Day == 1) return 1; 
    else
    
        //得到本月第一天  
        DateTime dtStart = new DateTime
        (dtSel.Year, dtSel.Month, 1); 
        //得到本月第一天是周几  
        int dayofweek = (int)dtStart.DayOfWeek; 
        //如果不是以周日开始,需要重新计算一下
        //dayofweek,详细风DayOfWeek枚举的定义  
        if (!sundayStart) 
        
            dayofweek = dayofweek - 1; 
            if (dayofweek < 0) dayofweek = 7; 
        
        //得到本月的第一周一共有几天  
        int startWeekDays = 7 - dayofweek; 
        //如果要判断的日期在第一周范围内,返回1  
        if (dtSel.Day <= startWeekDays) return 1; 
        else
        
            int aday = dtSel.Day + 7 - startWeekDays; 
            return aday / 7 + (aday % 7 > 0 ? 1 : 0); 
        
    
}
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