Demo
Group GridView Header Columns by merging Cells in ASP.Net
CustomersEmployees
NameCountryNameCountry
John HammondUnited StatesAlbert DunnerBolivia
Mudassar KhanIndiaJason SprintCanada
Suzanne MathewsFranceAlfred LoboPhilippines
Robert SchidnerRussiaShaikh AyyazUAE