how to upload file one by one and first bind it to gridview

What do you want to store in gridview, File Path?

Then, simply store the file locally one by one and maintain it in DataSet finally save all the files to the database using DataAdapter.Update(ds);

you can copy uploading code from that link.

https://www.c-sharpcorner.com/article/file-uploading-in-asp-net-c-sharp-using-gridview/

i dont want to save it database just bind it ti gridview .

i want to save as bulk

https://www.c-sharpcorner.com/blogs/upload-file-show-in-grid-view-store-database-and-download-using-asp-net-and-c-sharp