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The ClientScriptItem.Source property specifies an external source location for the client script contents. Typically, the script statements for a script element are specified using either the ClientScriptItem.Text or ClientScriptItem.Source property.
If the ClientScriptItem.Source property is null or an empty string (""), the src attribute is not set in the script element.
The ClientScriptItem.Source property is initialized by the ClientScriptItem.#ctor(string, string, string, string, string).