To answer this question, we need to understand the different controls and their interfaces.
Option A) Datalist - This option is incorrect because a Datalist control provides a visible interface, usually in the form of a dropdown list, where users can select an option from a predefined set of values.
Option B) DropdownList - This option is incorrect because a DropdownList control provides a visible interface, usually in the form of a dropdown list, where users can select an option from a predefined set of values.
Option C) Repeater - This option is correct because a Repeater control does not have any visible interface. It is used to dynamically repeat a specified template for each item in a data source, but it does not provide any visible UI elements itself.
Option D) Datagrid - This option is incorrect because a Datagrid control provides a visible interface to display and manipulate tabular data. It typically includes features such as sorting, paging, and editing of data.
The correct answer is C) Repeater. This option is correct because the Repeater control does not have any visible interface.