A very nice article for this, http://www.aspdotnet-suresh.com/2012/05/gridview-with-in-gridview-or-nested.html If it helps you then mark it as an accepted answer otherwise let me know ..i will send you the code..

http://www.c-sharpcorner.com/uploadfile/a577f3/gridview-nested-inside-another-gridview-in-Asp-Net/default.aspx http://www.c-sharpcorner.com/UploadFile/satyapriyanayak/nested-gridview-in-Asp-Net/ http://www.c-sharpcorner.com/UploadFile/rohatash/showing-category-and-subcategory-using-nested-gridview-in-as/