The type of service to call. For AjaxMethodCallback call the current page, control or CallbackHandler. For WCF and ASMX point at ServerUrl at a WCF or ASMX Service respectively.

This method affects only what type of client proxy is created to allow for straight method callbacks and for all but Page callbacks you'll need to set the ClientProxyTargetType in code.

public AjaxMethodCallbackServiceTypes ServiceType { get; set; }