MSChart have a problem of maintaining data state during post back. When a post
back happens the Chart will get blank or data get cleared.
Typically charts are used to provide a presentation of data in graphical manner.
How can we make the chart object persist its data during post back? There are
couple of ways:
1. By using the chart ViewState, but ViewState have its own problems.
Before enabling ViewState
![MSChart1.gif]()
After enabling ViewState
<asp:Chart
ID="Chart1"
runat="server"
EnableViewState="true">
![MSChart2.gif]()
You can see the difference in bytes size.
2. By again re-populate the chart with data from database. On every post
back we need to use this.
3. Or save the dataset/datatable and later use for rebinding.
4. Another efficient way is by saving the Chart into a file. It can be
binary or xml.
By using Charting SerializationFormat, refer msdn URL for more information.
http://msdn.microsoft.com/en-us/library/system.web.ui.datavisualization.charting.serializationformat.aspx
Sample code attached, Please post your responses.