https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.webcontrols.repeater?view=netframework-4.7
A data-bound list control that allows custom layout by repeating a specified template for each item displayed in the list.
Represents an item in the Repeater control.
Remarks
A RepeaterItem object represents an item in the Repeater control, such as the heading section, footer section, or a data item.
The data items of the Repeater control are stored in a RepeaterItemCollection object that can be accessed by using the Items property of the Repeater control.
You can use a RepeaterItem object to programmatically access the properties of an item in the Repeater control.
https://www.codeproject.com/Articles/23452/The-ASP-NET-Repeater-Control