How to replace string with User Control in ASP.NET WebForms?

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I have such HTML content in database:\[code\]<div class='content'>This is the test text <cms:control name='test' /></div>\[/code\]I need to render this content on page, but replace \[code\]<cms:control name='test' />\[/code\] with related user control.I can not parse control to string, because it might be a complex with ajax controls, validators and so on.What is the best way to do that?