ICallbackEventHandler
A shim of the .NET interface for platforms that do not support it.
Used to indicate that a control can be the target of a callback event on the server.
using System.Runtime.CompilerServices;
namespace System.Web.UI
{
[System.Runtime.CompilerServices.NullableContext(1)]
public interface ICallbackEventHandler
{
void RaiseCallbackEvent(string report);
string GetCallbackResult();
}
}