Note also that DataFieldX property is available only for a databound numeric series and not for LineSeries. The configuration of the RadHtmlChart depends on the type of the chart. There are charts which use category XAxis (i.e. Area, Bar, Line, Column, Candlestick) and charts which use numeric XAxis (i.e. Scatter, ScatterLine, Bubble). You can go through Chart Types section of the online demos in order to examine the different chart types..
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As per our requirement, I have to adopt the upper stated method (i.e. creating seriesitem and series programmatically and then add them in to chart.)
Now i want to show tooltip apart of x-axis and y-axis that we provided in series item. how can i achieve that?
I guess you want to show the ToolTip for the x-axis and y-axis item in the RadHtmlChart. By default RadHtmlChart will show ToolTip based on the x axis and y axis value. In the Provided demo it has mentioned in that Page_Init event. Please elaborate your requirement if it doesn't help.