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For DDCell's BorderDiagonalEnum property.
public enum BorderDiagonalStyles : byte
  | Name | Description | 
|---|---|
| Both | Includes both Up & Down styles, forming an X across the cell.  | 
      
| Down | Starts in the upper left corner, and goes down to the lower right corner.  | 
      
| None | No diagonal border will be drawn.  | 
      
| Up | Starts in the bottom left corner, and goes up to the upper right corner.  |