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Push a copy of an object to client

To reduce postbacks and database calls, a copy of the current object(s) can be pushed down to the client in JSON format. Say a webpart renders information about a person, another webpart shows related information which is retrieved dynamically (like web services). Instead of getting the current person from the database in the second webpart again, we can reuse the same person object from the first webpart. To do so we must provide a DataContract for the Person class:

public class Person
	public string Firstname { get; set; }
	public string Lastname { get; set; }
	public string PhoneMobile { get; set; }

Then we can serialize the current object using DataContractJsonSerializer:

private void RegisterPersonOnClient(Person person)
	var serializer =
		new System.Runtime.Serialization.Json
	var ms = new MemoryStream();
	serializer.WriteObject(ms, person);
	var json = Encoding.UTF8.GetString(ms.ToArray());
	var script = "var personOnClient = " + json + ";\n";
		.RegisterStartupScript(GetType(), "uniqueScriptKey", script, true);

To be able to use these classes, add reference to System.Runtime.Serialization and System.ServiceModel.Web dlls. Don’t forget to append a semicolon and newline so that script doesn’t collide with other scripts.

On the client we get a copy of the person object:

Then this object can be used eg. for loading a profile from remote service

function openRemoteModalDialog() {
	if (typeof (personOnClient) !== undefined) {
		var p = {
			firstname: personOnClient.Firstname,
			lastname: personOnClient.Lastname,
			email: personOnClient.Email,
			mobile: personOnClient.PhoneMobile
		var q = "?" + $.param(p);
		openModalDialog(remoteUrl + q);

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