In cases when you don’t have enough room on the axes to display your annotation you can set the NoAnnoOverlap property to True so it will suppress the drawing of any axis annotation that would overlap a previously drawn annotation regardless of the reason for the overlap.

If you have AutoMajor property set to true then you don’t need to use the NoAnnoOverlap property because the AutoMajor property will automatically calculate the best value for the major tick marks.

The following chart displays the NoAnnoOverlap property set to True:

The following chart display the NoAnnoOverlap property set to False: