Hi everybody,

I am using the RadGridScheduler Component to manage Activities by moving, editing or deleting them. In order to display a detailed view of the activity, a details window is opened using the RadWindowManager.

On this details view there is a button to delete the current activity. When I do this, the window gets closed and a javascript callback method is called from the scheduler’s aspx site to refresh the current  content.

However, after the activity has been deleted within the RadScheduler’s  AppointmentDelete event and the aspx site gets load again, the following Exception has been thrown:

[NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.]

   Telerik.Web.UI.SchedulerPostBackEvent.DeserializeFromJSON(String json) +85

   Telerik.Web.UI.RadScheduler.RaisePostBackEvent(String eventArgument) +67

   Telerik.Web.UI.RadScheduler.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7

   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11

   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +177

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746 

Has anybody an idea, what went wrong?

Thanks in advance.

void CheckedChanged(object sender, System.EventArgs e)

{

CheckBox chkBox = (sender as CheckBox);

GridDataItem item = (GridDataItem)chkBox.NamingContainer;

RequiredFieldValidator reqval = (RequiredFieldValidator)item["EndDateTime"].FindControl("reqEndDate");

RegularExpressionValidator regexval = (RegularExpressionValidator)item["EndDateTime"].FindControl("regexEndDate");

if (chkBox.Checked)

{

reqval.Enabled =

false;

regexval.Enabled =

false;

}

}

Here is the ASPX

<EditItemTemplate>

<asp:TextBox ID="EndDateTimeTextBox" runat="server" ></asp:TextBox><asp:RequiredFieldValidator

ID="reqEndDate" runat="server" ControlToValidate="EndDateTimeTextBox" ErrorMessage="A valid US Date & Time is Required."

Style="left: 2px; position: relative">*</asp:RequiredFieldValidator><asp:RegularExpressionValidator

ID="regexEndDate" runat="server" ControlToValidate="EndDateTimeTextBox" ErrorMessage="Please enter a valid US Date & Time."

Style="position: relative" ValidationExpression="^(([1-9])|(0[1-9])|(1[0-2]))\/(([0-9])|([0-2][0-9])|(3[0-1]))\/(([0-9][0-9])|([1-2][0,9][0-9][0-9]))\s(1[0-2]|[1-9])\:[0-5][0-9]\s(a|p|A|P)(m|M)$">*</asp:RegularExpressionValidator>

<br />

<asp:CheckBox ID="chkIsFullDay" runat="server" Style="position: relative" Text="Full Day" AutoPostBack="True" OnCheckedChanged="CheckedChanged" />

</EditItemTemplate>