Hi Ravi,
We regret for the delay in updating you. It is possible to set the Text as "Ser..." when series name it very long using the Series.Text property as given below.
Example:
series.Text = series.Name.Substring(0, 5) + "..."; // to display first 5 characters of series Name
I have attached a sample that illustrates the same in this link below.
http://websamples.syncfusion.com/samples/Chart.Windows/F74890/main.htmBut We regret to inform you that we do not have support for ToolTip for Legend.
I have created A feature request in this regard and have forwarded it to Our Development Team.I will get back to you regarding the timeline for implemting this feature with in a week.
Kindly let us know if you have any questions. Thanks for your patience.
Regards,
Manohari.R