Hello Essoufi,
Special characters in data source field names should be escaped as per this article - http://www.telerik.com/help/aspnet-ajax/htmlchart-troubleshooting-common-issues.html#data-source-field-name-special-chars
Regards,
Danail Vasilev
Telerik
Special characters in data source field names should be escaped as per this article - http://www.telerik.com/help/aspnet-ajax/htmlchart-troubleshooting-common-issues.html#data-source-field-name-special-chars
Regards,
Danail Vasilev
Telerik
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