Merging cells allows you to display data in a clear, appealing way, because it highlights groups of identical information. It also gives you flexibility to build tables similar to the ones you can create in HTML or using Microsoft Word, both of which support merged cells.

To create tables with merged cells, set the AllowMerging property to a value other than AllowMergingEnum.None, and set the RowCol.AllowMerging property of individual rows and columns true for the rows and columns you wish to merge. After these properties are set, the grid will automatically merge adjacent cells that have the same contents.

Whenever the cell contents change, the grid updates the merging state.

Reference

C1FlexGrid Class
C1FlexGrid Members