We are attempting to make use of ChartView to plot a large number of data points, which display live data which is being received one point at a time. We are experiencing poor performance, with the charts rendering extremely slowly and presence of the resultant chart causing the application performance to drastically deteriorate, (presumably because of the large number of graphical elements present on screen).

We are attempting to implement a LineSeries (or FastLineSeries) which can display up to 90,000 data points.

Is there any guidance available regarding the capability of ChartView to plot a large number of points? Is plotting this many points something ChartView is capable of?

I believe that Telerik UI for WPF contains functionality to reduce the number of plotted points using sampling. Is there similar functionality available for Telerik UI for WinForms? Can you suggest an approach to implement similar functionality in a WinForms application?

For our requirements, one point is added to our dataset at a time; the remainder of the dataset remains fixed. Presumably, the entire chart is redrawn each time a new point is added, which is computationally expensive. Is there any way we can improve the chart rendering performance by removing the need to redraw the entire chart, adding only the novel data points to a pre-existing drawn series?

Are there performance considerations one should take into account when deciding whether to take  a data-binding-based approach or to directly add the DataPoints?

Hi Telerik support,

I've created a sample application with a gridview containing more combobox columns. In this forum I found some code snippets to auto open the dropdown box when one navigates to the cell (with the keybord arrow keys).

It seems to work fine except for one scenario..

click (with mouse) on the first column (which is readonly), then navigate to the next column with the arrowkey right. The focus jumps to the third column. If I navigate from the third column to the second (also with arrowkeys), it's ok.

Please try this also with column nr. 5 and 6. (so click on 5 and navigate to 6). After the application newly started, it also jumps away. But only the first time.

Can you help me out of this behaviour?

Kind regards,

Daniel Kaya

Hi all,

I wish to open a DropDown list in a context menu when a user right click on a GridView cell and handle the click event on an element of this DropDown list.

I am a bit lost between the GridView context menu documentation and the one specific to general context menus

I tried using the RadMenuComboItem (as described in this document) but the result is no satisfactory.  

Would someone have a simple example on how to do this ?

Many thanks

Patrick

Does anyone know if it's possible to change the behaviour of the Spreadsheet column 'autoFitWidth' method?

It does exactly what it says, and changes the column width to fit the contents of the column. My problem is that it's TOO good, and everything looks a bit squashed:

What I would like is to add a bit extra to the columns :

I think it just looks a bit more friendly.

Hi,

I've been searching now for hours for something that should be simple so I ask it here.

The radGridView got a area where columnheaders can be dropped. The panel has the default text: Drag a column here to group .... See also the attached image.

I want to change the height of that area but can't figure out how. Help would be appreciated.

Regards,

Daniel

Hello everyone!

EDIT: Also read the comment!

I'm currently moving some projects from DotNetBar to Telerik UI WinForms and trying a bit around the HTML makrup feature.

Is there a way to hook to an event to provide a custom way to resolve the "src" attribute of the "img" node, like in DotNetBar (see picture)? I searched thorugh all the assemblies using the IDE and I searched throw the forum, but yet I'm still not sure if there is maybe already an option for and I just can't find it.

With this custom handling it would be possible to use already loaded images or provide images from a custom destination e.g. from a ResX file. All my images and icons are stored in ResX files and I really want to avoid to put some of icons also as embedded ressource because they are already available within a resource file itself.

(Tagged as "Label" as "Markup" or "Html" does not exists and here I want to put the text into a RadLabel.)

Hi, 

how can i do?

i need to Mantain the value of text when not match with the list radmulticolumncombobox