问题：
在点击按钮查询显示Dundas图时，报错：Series["jjj"]丢失。
查了一下错误日志：发现，在PostBack时， Series的状态丢失。
解决方案：
在Chart中加一个属性 CallbackStateContent="All" ，即可保存和恢复Series和DataPoint的所有状态。
相关文档：
public enum CallbackStateContent : |
Members
| Member | Description |
|---|---|
| Auto | Automated selection of save/restore behaviour. |
| ChartStateOnly | Saves and restores the all chart state without series data points. |
| SeriesDataOnly | Saves and restores the only chart series data points. |
| All | Saves and restores the all chart state including series data points. |
| None | Saving and restoring will be not performed. |
Example
In this example, we set a charts CallbackStateConent property to SeriesDataOnly.
| Visual Basic |  Copy Code |
|---|---|
Imports Dundas.Charting.WebControl |
|
| C# | Copy Code |
|---|---|
using Dundas.Charting.WebControl; |
|
Remarks
The CallbackStateContent Auto works under folowing rules:
- All - if UI is activated (Toolbar and context menu).
- SeriesDataOnly - if scrolling and zooming is enabled, and the particular series is not using data-binding.
- None - in all other cases including when user callback is used.
Inheritance Hierarchy
Dundas.Charting.WebControl.CallbackStateContent