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true if the script block is registered; otherwise, false.
Call this method before calling Page.RegisterClientScriptBlock(string, string) to avoid unnecessarily assembling the client-side script. This is particularly important if the script requires a large amount of server resources to create.
The Page.IsClientScriptBlockRegistered(string) method has been deprecated. Use the erload:System.Web.UI.ClientScriptManager.IsClientScriptBlockRegistered method in the System.Web.UI.ClientScriptManager class.