I was receiving exceptions when attempting to set range at runtime on the range selector.

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=Telerik.WinControls.ChartView
  StackTrace:
   at Telerik.Charting.CombinedBarSeriesRoundLayoutStrategy.ApplyLayoutRoundingVertical(LayoutContext context)

So I stripped the form out of the main project and I've put it into a sample application. Commenting out lines 13 and 14 of FrmPerformanceChart.cs leads to different levels of nightmare.

Link to project is  sample: testchart

void Export(String sFilepath, RadGridView grvExportExcel)

{

try

ExportToExcelML exporter = new ExportToExcelML(grvExportExcel);

exporter.SummariesExportOption =

SummariesOption.ExportAll;

exporter.RunExport(sFilepath);

}

catch (Exception)

{

throw;

}

}

Thanks for your help.
Best wish
Elver Cano

Hi,

Is it possible to add shadows to my radforms ?

Thanks for your response

The MultiColumn ComboBox is always selecting a value after data is added to it. Is it possible to have it work almost exactly the same as the DropDownList?

For i As Integer = 1 To 12

    Me.MultiColumnComboBox1.EditorControl.Rows.Add(i, "Row " & i)

    Me.RadDropDownList1.Items.Add(i)

Next

Hi Admin,

MouseHover - I want to open the one of form and  once the mouse is moved away the form closes

Please tell to me how to do like that?

Thanks,

Moe

Dear Admins.

I was Using the following code for populating radGridView. But it was little bit slower (items Count was more then 40,000)

Then i give a try to use VirtualGrid (By using the Example given in the Documentation), to check the performance difference.it is good.

I have some question regarding presentation/ populating of VirtualGrid.

The ItemClass is used to populate the VirtualGrid have 15 columns(Attributes),

1. I want to load only some of them, Locating at different Column Numbers not in Sequence. Like i have Column Number from 1...15, I want to display only 1,3,6,10th Column Numbers(Index Numbers).
2. How to Hide any Column which is already populated in the Grid.
3. I want to make custom filter functionality. I Have a Text Box above the VirtualGrid. I want to use that TextBox to apply the Filter on the Grid by Typing the Item Name, and Grid filter the Number of items according the typed text and display in the grid.
4. How to Clear VirtualGrid rows.

I can use these functionalities by using the radGridView, but due to performance i want to use Virtual Grid.

I have achieved this behavior using the Microsoft DataGridView. But due to Conversion. I want to use all the controls only from telerik. (Using R2 2019 SP1)

If possible any working example will be appreciated. 

Hi *,

I follow the docs and use

Unfortunately my open file Dialog does not accept the theme I set for the application.

Questions:

- is this a right way to set app theme in the ctor of main window (after Initialize component of Course)?

- I would like to use a new folder select dialog by Rad Browse Editor. How to do this?

Thanks a lot

Rostislaw