Application - Manage App Menu Screens(Presentation)System.NullReferenceException: Object reference not set to an instance of an object.

   at Administration_Application_ManageAppMenuScreens.RadTreeView1_HandleDrop(Object sender, RadTreeNodeDragDropEventArgs e) in c:\Redux_Code\net\web\Administration\Application\ManageAppMenuScreens.aspx.cs:line 105

Can any one help me in solving this problem?

telerik:RadNumericTextBox ID="tbx1" Runat="server"

Culture="English (United States)" DataType="System.Int16" MaxValue="400"

MinValue="0" ShowSpinButtons="True" Width="35px">

<NumberFormat DecimalDigits="0" />

</telerik:RadNumericTextBox>

Code behind:
Function CollectAnswer() as string
Dim

strResult As String = ""

Dim tbox As RadNumericTextBox

tbox = CType(Page.FindControl("tbx1"), RadNumericTextBox)

strResult = tbox.Text

Return strResult

tbox = Me.FindControl("tbx1") as the third line, same results

• PictureID - int
• Title - varchar
• Approved - bit

We have a RadCalendar implemented on a web site which is exhibiting unexpected and undesirable behavior when combining the browser back button and the RadCalendar Forward 1 View button on the control. The problem occurs in both IE and Firefox.  We are using IE version 7.0.5730.13 and Firefox version 3.0.10.

To see the issue, go to our staging/test version at:




http://204.255.139.168/CIED_Conference_Tool/

There is a RadCalendar near the bottom of the page.  Don't click on a calendar yet, but select an Event from the drop-down just above it.  Select "Testing 50005".  You will be sent to the default Event page.

Now click the browser Back Button.  Now, click the Forward 1 View button (the right arrow image just to the right of the Month/Year display in the RadCalendar header).

Instead of switching the calendar to the next month it instead forwards you to the page you were just at.

This is very strange since the Forward 1 View works fine if the Back Button is never used.

The markup for the Calendar is:

<telerik:RadCalendar ID="RadCalendar1" Skin="Inox" runat="server" AutoPostBack="True" OnSelectionChanged="SelectedDateChange" OnDefaultViewChanged="NavigationChanged" EnableMultiSelect="False" SelectedDate="" ShowRowHeaders="False" width="231px">
            <CalendarDayTemplates>
                <telerik:DayTemplate ID="dayTemplate1">
                    <Content>
                        <asp:Label id="lblDay1" runat="server" Text="Event Day!" />
                    </Content>
                </telerik:DayTemplate>
                 <telerik:DayTemplate ID="dayTemplate2">
                    <Content>
                        <asp:Label id="lblDay2" runat="server" Text="Event Day!" />
                    </Content>
                </telerik:DayTemplate>
                <telerik:DayTemplate ID="dayTemplate3">
                    <Content>
                        <asp:Label id="lblDay3" runat="server" Text="Event Day!" />
                    </Content>
                </telerik:DayTemplate>
                 <telerik:DayTemplate ID="dayTemplate4">
                    <Content>
                        <asp:Label id="lblDay4" runat="server" Text="Event Day!" />
                    </Content>
                </telerik:DayTemplate>
                 <telerik:DayTemplate ID="dayTemplate5">
                    <Content>
                        <asp:Label id="lblDay5" runat="server" Text="Event Day!" />
                    </Content>
                </telerik:DayTemplate>
            </CalendarDayTemplates>

            <specialdays>
                <telerik:RadCalendarDay TemplateID="dayTemplate1" Date="2006-01-01"
                    ToolTip="">
                </telerik:RadCalendarDay>
                <telerik:RadCalendarDay TemplateID="dayTemplate2" Date="2006-02-01"
                    ToolTip="">
                </telerik:RadCalendarDay>
                <telerik:RadCalendarDay TemplateID="dayTemplate3" Date="2006-03-01"
                    ToolTip="">
                </telerik:RadCalendarDay>
                <telerik:RadCalendarDay TemplateID="dayTemplate4" Date="2006-04-01"
                    ToolTip="">
                </telerik:RadCalendarDay>
                <telerik:RadCalendarDay TemplateID="dayTemplate5" Date="2006-05-01"
                    ToolTip="">
                </telerik:RadCalendarDay>
            </specialdays>
        <HeaderStyle ForeColor="#00457c" BackColor="#00457c"></HeaderStyle>
        <SelectedDayStyle BorderColor="#573d08" BackColor="#573d08" />
        <CalendarTableStyle BackColor="#ffffff" />
        
        
        </telerik:RadCalendar>




The only code-behind we have is for the server-side event "SelectedDateChange":

protected void SelectedDateChange(object sender, SelectedDatesEventArgs e)
        {
            
            Label8.Visible = true;
            Label8.Text = "Event Info:" + "<br />";
            for (int i = 0; i < e.SelectedDates.Count; i++)
            {
                _date = (e.SelectedDates[i]).Date;                

                cgDataSet.tbl_eventDataTable dt = _eventContentAdapter.GetEventBeginDataByDate(_date);            
                if (dt.Rows.Count != 0 )
                {
                    cgDataSet.tbl_eventRow row = dt[0];

                    String eventName = row.event_name;


                    IRewriteTransform transform = new ConferenceGeneric.cgControls.cgUrlRewriting.SpaceToUnderscoreTransform();

                    //supply client name in URL for each of these anchors
                    HtmlAnchor[] anchors = { aHome, aAgenda, aRegistration, aDirections, aSecurity };
                    foreach (HtmlAnchor anchor in anchors)
                    {
                        anchor.HRef = formatWithTransformedName(anchor.HRef, transform, eventName);
                    }
                    Label12.Visible = true;
                    Label12.Text = row.event_begin_date.ToShortDateString() + "-" + row.event_end_date.ToShortDateString() + "<br />";
                    Label6.Visible = true;
                    Label6.Text = "Event Name:" + "&nbsp;" + row.event_name + "<br />";
                    Label9.Visible = true;
                    Label9.Text = "Event Location:" + "&nbsp;" + row.event_location + "<br />";
                    hl.Visible = true;
                    hl.NavigateUrl = aHome.HRef.ToString();

                    Label7.Visible = false;
  
                }
                else
                {
                    Label7.Visible = true;
                    Label7.Text = "There are no events for the selected date.";
                    Label6.Visible = false;
                    Label9.Visible = false;
                    Label8.Visible = false;
                    Label12.Visible = false;
                    hl.Visible = false;
                }
            }
 
        }