ARI is a free .NET Ajax programming library that removes all the complexity associated with developing Ajax enabled web sites. ARI allows you to execute methods in the App_Code directory of your ASP.NET web site using an extremely simple call syntax. ARI understands data mapping between C# and JavaScript, and handles everything for you, such as: data marshalling, method invocation via refelection, method overloads, callbacks, and fault handling....
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This download (ARI Asynchronous Remote Interface) is freeware. "Freeware is copyrighted computer software which is made available for use free of charge, for an unlimited time, as opposed to shareware where the user is required to pay (e.g. after some trial period or for additional functionality)." More info at
Wikipedia.
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