Hi everyone,
I am testing Planner.net trial version. When we are trying to remove an item then we are getting an exception.

"cannot remove the specified item because it was not found in the specified collection"

Here is the code
Any help will be appreciated

    Private Sub mfsSchedule_ItemClick(ByVal sender As Object, ByVal e As MindFusion.Scheduling.WinForms.ItemMouseEventArgs) Handles mfsSchedule.ItemClick
       Try
           If e.Clicks = 1 And e.Button = Windows.Forms.MouseButtons.Right Then
               Dim myAppForm As frmAppointment = New frmAppointment()
               myAppForm.ItemHeader = e.Item.HeaderText
               myAppForm.ItemSubject = e.Item.HeaderText
               myAppForm.ItemStartDate = e.Item.StartTime
               myAppForm.ItemStartTime = e.Item.StartTime
               myAppForm.ItemEndDate = e.Item.EndTime
               myAppForm.ItemEndTime = e.Item.EndTime
               Dim _result As DialogResult = myAppForm.ShowDialog(Me)
               If _result = System.Windows.Forms.DialogResult.OK Then
                   mfsSchedule.BeginInit()
                   mfsSchedule.Schedule.Items(e.Item.Id).HeaderText = myAppForm.ItemHeader
                   Dim _startdate As DateTime = New DateTime(myAppForm.ItemStartDate.Year, myAppForm.ItemStartDate.Month, myAppForm.ItemStartDate.Day) + myAppForm.ItemStartTime.TimeOfDay
                   Dim _enddate As DateTime = New DateTime(myAppForm.ItemEndDate.Year, myAppForm.ItemEndDate.Month, myAppForm.ItemEndDate.Day) + myAppForm.ItemEndTime.TimeOfDay
                   mfsSchedule.Schedule.Items(e.Item.Id).StartTime = _startdate
                   mfsSchedule.Schedule.Items(e.Item.Id).EndTime = _enddate
                   mfsSchedule.EndInit()
               ElseIf _result = System.Windows.Forms.DialogResult.Abort Then
                   Dim rec As New MindFusion.Scheduling.Recurrence()
                   If e.Item.RecurrenceState = MindFusion.Scheduling.RecurrenceState.Occurrence Or _
                           e.Item.RecurrenceState = MindFusion.Scheduling.RecurrenceState.Exception Then
                       e.Item.Recurrence.MarkException(e.Item, True)
                   Else
                       mfsCalendar.Schedule.Items.Remove(e.Item)
                   End If
               End If
           End If
       Catch ex As Exception
           sMsgStr = "Açıklama : Hata" & vbCrLf & vbCrLf
           sMsgStr = sMsgStr & "--- Ayrıntılar ----------------------------" & vbCrLf
           sMsgStr = sMsgStr & "Lokasyon : " & "frmMenu" & vbCrLf
           sMsgStr = sMsgStr & "Fonksiyon: mfsSchedule_ItemClick" & vbCrLf
           sMsgStr = sMsgStr & "Mesaj       : " & ex.Message.ToString()
           vResult = MessageBox.Show(sMsgStr, "İşlem Hatası", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1)
       End Try
    End Sub

Hi,

You are right, it is a fault. I just copy that line from a samplei and change with wrong instance. 

Nowadays I am working too hard, it is a just programmer blindness. Sorry for your time vasting.

Thank a lot for your help