I have a ZedGraph stacked bar graph, and I want each bar to show its value on a label.
So far no problem.
But is there any built-in function to prevent labels from overlapping?
Here is a screenshot showing the problem:

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I would suggest just changing the angle property for your labels’
FontSpec.Use i.e. about 30-45 degrees and you have your problem solved.
See:
http://zedgraph.sourceforge.net/documentation/html/T_ZedGraph_TextObj.htm