I was able to create RadCharts dynamically in code in the prior version of the control. I upgraded to the latest version of the RadChart, (install is: RadControls_for_ASP.NET_AJAX_2008_1_415_dev.exe), and now it does not work at all. I get a NullReferenceException when trying to use my chart variable. My code is:
Dim radchart As Telerik.Charting.Chart
Dim chartSeries As New ChartSeries()
chartSeries.Name =
"Count of Answers"
chartSeries.Type = ChartSeriesType.Bar
Dim answersForQuestion As System.Data.DataSet = GetReportDataForQuestion(questionID)
For currentRow = 0 To answersForQuestion.Tables(0).Rows.Count - 1
Dim answerCount As Integer = answersForQuestion.Tables(0).Rows(currentRow).Item("CountOfAnswer")
Dim answerText As String = answersForQuestion.Tables(0).Rows(currentRow).Item("AnswerText")
chartSeries.AddItem(answerCount, answerText)
Next
radchart.Series.Add(chartSeries) <-- Exception occurs here.
Could you please tell me how I can dynamically add a Chart using the latest version of the control?
1 Answer, 1 is accepted
0
Hi Mike,
You need to either reference the correct chart instance if you have defined it in the ASPX, or create a new one in the code-behind -- from the sample code snippet it seems you are trying to access the radchart variable prior to initializing it hence you get the NullReferenceException.
Best wishes,
Manuel
the Telerik team
Instantly find answers to your questions at the new Telerik Support Center
You need to either reference the correct chart instance if you have defined it in the ASPX, or create a new one in the code-behind -- from the sample code snippet it seems you are trying to access the radchart variable prior to initializing it hence you get the NullReferenceException.
Best wishes,
Manuel
the Telerik team
Instantly find answers to your questions at the new Telerik Support Center