I have a radhtmlchart with donut series. I displays different values in labels but text of labels get overlap and does not read properly.
This is my code:
<telerik:DonutSeries Name="Transactions" DataFieldY="Transactions"
NameField="Name" ColorField="ColorValue">
<LabelsAppearance Visible="true" DataFormatString="{0}%" Position="Column">
</LabelsAppearance>
</telerik:DonutSeries>

Columnis an invalid value for thePositionproperty, use one of the valid ones (see List 2 here: http://docs.telerik.com/devtools/aspnet-ajax/controls/htmlchart/server-side-programming/series-configuration#attribute-properties-in-seriestype--labelsappearance)http://screencast.com/t/M4FK0kA5 is what I get from