In grid view open property builder, I've added the header column field and I'm assigning data source in the code behind.
From the below link solution, For the gridlines alone we tried to set the style but it's not working.
link: https://www.telerik.com/support/kb/winforms/gridview/details/radgridview-merge-celss
How to set the for the grid rows without the header.
Attached image for your reference.