Explain few ScriptManager properties which are often used?

Answer:

AsyncPostBackTimeout - Gets or sets the time in seconds before asynchronous postbacks time our if no response is received
ClientID - Gets the server control identifier generated by ASP.NET (The id for this control that is rendered on the page)
EnablePageMethods - Gets or sets whether public static page methods in asp.net page can be called from client script.
EnableViewState - Gets or sets a value that indicates whether server control persists its viewstate and the viewstate of its child control if any.
EnablePartialRendering - Gets or sets a value that enables partial rendering of a page, which in turn enables you to update regions of the page individually by using UpdatePanel controls.