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asp.net charting

Last Modified: 2012-05-12
If have the below code that generates a chart for data in a database.  It works fine except that when the parameter dictating the data column in the database to use is changed in some cases it does not display the line in the chart.  The only difference is that the lines that are not display have the same yvalue - straight horizontal line.

I need to display the as a straight line.  The chart the shows up shows a single xaxis lable in the center (Date) of the axis and ofcourse no plotted points.  I have verified the database shows data in the colummn and all are at a value.

Any help would be approciated.

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