The easy question first: To add labels to the edges, go to NodeXL, Show/Hide, Workbook Columns in the Excel ribbon and check Labels. This will reveal a Labels column in the Edges worksheet.
On the edge style question, I misunderstood: I thought you were writing your own application using our NodeXLControl. If you wanted to add edge styles to the Excel template, which uses the NodeXLControl to display the graph in the graph pane, you would
have to do the following:
1. Modify the EdgeDrawer class to support different edge styles, based on the presence of a new metadata value on the edges.
2. Add a Style column to the Edges worksheet on the NodeXLGraph.xltx template.
3. Modify the EdgeWorksheetReader class to read the Style column and set the appropriate metadata on each edge as it is read.