Access custom server classes from Javascript

I am in the process of migrating my VS2005/Atlas app to VS2008/ASP.Net AJAX.

In the old app I could instantiate custom c# classes on the server from within javascript.

An example would be var myObj = new MM.Test();

In the new app this no longer works and throws the 'object expected' exception.

Any ideas what I need to do in order to get this to work?

You have to mark your Webservice/WebMethod with the GenerateScriptType attribute which will include the server side types that you need to create in the client. for the above you have to add the following:

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ScriptService]
[GenerateScriptType(typeof(MM.Test))]
public class MyService
{
.........................
.........................
}

Thanks for that.

Should intellisense sense then work on the members of this class?

Also, my usage is more complex than that. I have a class named Contract that has a generic collection as one of its members. You don't seem to be able to use GenerateScriptType with generic collections so how do I access the collection and its members (specifically the add method.which worked fine using VS2005/Atlas)?

public class Contract
{
public Contract();
public PeriodCollection Periods { get; set; }

}

public class PeriodCollection : Collection<Period>
{
public PeriodCollection();
public string Year { get; set; }
}

I think the intellisens should work if you are working in VS2008.

You do not have to worry about the Collection, it will be convertet to JS Array no matter it is Generic or Regular Collection.

In that case you should add more than one GenerateScriptType in your Web Service or WebMethod.

[GenerateScriptType(typeof(class1))]
[GenerateScriptType(typeof(class2))]
[GenerateScriptType(typeof(class3))]
public class MyService{
}

Hope this will help .and mark it as answer if it solves your issue.