Sets or returns whether series data labels will contain the category name (x value).

 public boolean ContainsCategoryName{ get; set; }

Public Property ContainsCategoryName() As Boolean

This defaults to false when creating a new Series.
The data label is considered disabled if this and ContainsBubbleSize, ContainsSeriesName, ContainsValue, and ContainsValueAsPercentage are all false.
If the series category type is a scatter or bubble chart, then this property corresponds to the 'X Value' option under 'Label Contains' in Excel.