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copied!<p>Page internally stores in private '_contentTemplateCollection' hashtable. it uses ContentPlaceHolderID property as key and stores special class (that will be used to build/initialize Content tag) as a value - so to change ContentPlaceHolderID value (defined within markup) you need to modify this hashtable, remove old entry linked with old Id and add other entry with new Id - you need to change ContentPlaceHolderId before creating master page otherwise an exception will be thrown in runtime - best place to change Ids is Page 'preinit' event and if it is better to change Ids before change master page (if you will change master page at runtime)</p> <p>To change ContentPlaceHolderID of Content tag, you can use following function in Page PreInit event</p> <pre><code>public static void AssignContentToNewPlaceHoldersWithinPage(Page pPage, string pOldId, string pNewId) { if (pPage == null || string.IsNullOrEmpty(pOldId) || string.IsNullOrEmpty(pNewId)) { return; } // Try to get a reference to private hashtable using fasterflect free reflection library in codeplex (http://fasterflect.codeplex.com/) // you can replace following line with standard reflection APIs var lTmpObj = pPage.TryGetFieldValue("_contentTemplateCollection"); if (lTmpObj != null && lTmpObj is Hashtable) { var _contentTemplateCollection = lTmpObj as Hashtable; if (_contentTemplateCollection.ContainsKey(pOldId) && !_contentTemplateCollection.ContainsKey(pNewId)) { var lTemplate = _contentTemplateCollection[pOldId]; _contentTemplateCollection.Add(pNewId, lTemplate); _contentTemplateCollection.Remove(pOldId); } } } </code></pre> <ul> <li>function parameter are</li> <li>pPage is reference to page instance contains content tag</li> <li>pOldId is ContentPlaceHolderId property value in markup - the Id you want to change</li> <li>pNewId is the new Id you want to use</li> </ul> <p>I hope that my answer will be useful and I am sorry if my English language is not good</p>

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