calendar control doubt please clarify

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--i want to highlight the holiday list in the calendar

--i am getting Object reference not set to an instance of an object.

--:aspx page..ondayrender is there

ASP.NET

<asp:Calendar ID="clPopupCalendar" runat="server" Width="100%" CssClass="normalCalendar" Height="160px"
                       DayNameFormat="FirstLetter" ShowGridLines="True" OnDayRender="holidaylist" OnSelectionChanged="clPopupCalendar_SelectionChanged" >
                       <todaydaystyle forecolor="White" backcolor="Black"></todaydaystyle>
                       <SelectorStyle BackColor="Red"></SelectorStyle>
                       <nextprevstyle font-size="9pt" forecolor="#FFFFCC"></nextprevstyle>
                       <dayheaderstyle height="1px" cssclass="normalCalendarDayHeader"></dayheaderstyle>
                       <SelectedDayStyle CssClass="normalCalendarSelectedDay"></SelectedDayStyle>
                       <TitleStyle CssClass="normalCalendarTitle" BackColor="#6699CC"></TitleStyle>
                       <othermonthdaystyle forecolor="#FF0033"></othermonthdaystyle>

--code behind

C#

 public partial class UserControls_PopUpCalendar : TMSWeb.TMSBasePage
{


    List<datetime> dtholidays = null;

....



 public List <datetime> GetPublicHolidays()
    {
  
        List <datetime> list = new List<datetime>();
        list.Add(new DateTime(2013, 02, 07));
        return list;

    }

......


protected void holidaylist(object sender, DayRenderEventArgs e)

    {

        if (dtholidays.Contains(e.Day.Date))

        {

            e.Cell.BackColor = System.Drawing.Color.Green;

 

        }

--above---------------------------------------------------------------------------------------------
---if (dtholidays.Contains(e.Day.Date))
--i get
--Object reference not set to an instance of an object.

--it seems everyting fine for me....but why is thie error ?
Object reference not set to an instance of an object.

Posted 30-Jun-13 22:56pm

anurag19289

Updated 30-Jun-13 23:07pm

Sushil Mate

v3

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abhinavpratap · Answer 1 · 2013-06-30T23:04:00

Solution 1

dtholidays may be null, when you called GetPublicHolidays method
It must return list which should be assigned to dtholidays
like
dtholidays = GetPublicHolidays();

Set in PageLoad event of Page

Posted 30-Jun-13 23:04pm

abhinavpratap

Updated 30-Jun-13 23:05pm

v2

_Amy · Answer 2 · 2013-06-30T23:05:00

Yes this exception is obvious, because dtholidays is null. You check for null before using the variable. Try this:

C#

if(dtholidays != null){
    if (dtholidays.Contains(e.Day.Date))
    {
        e.Cell.BackColor = System.Drawing.Color.Green;
    }
}

As I can see your code, dtholidays is class level variable and it'll be reassigned on every postback and this will become null. Better, you store this list to session and whenever required fetch it from session.

--Amit