Example of Row Spanning (API) in ASP.NET Core Tree Grid Control
This sample demonstrates how the Tree Grid automatically merges adjacent cells containing same value across both rows and columns.
DEMO
SOURCE
In this demo, the "Start Date", "End Date", "Status", and "Permit Status" columns are merged when they share the same value. Row and column spanning can be enabled by setting enableRowSpan and enableColumnSpan to true, allowing the Tree Grid to merge adjacent cells both horizontally and vertically.
The "Phase Name" column remains frozen on the left side, achieved using the freeze property in the column definition.
More information on the Tree Grid component can be found in this documentation section.