Called prior to the rendering of a control. In a derived adapter class, generates opening tags that are required by a specific target but not needed by HTML browsers.
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The ControlAdapter.BeginRender(System.Web.UI.HtmlTextWriter) method is called just before the ControlAdapter.Render(System.Web.UI.HtmlTextWriter) method, and is used to perform target-specific preprocessing before the rendering of the control.
Use the ControlAdapter.BeginRender(System.Web.UI.HtmlTextWriter) method in combination with the ControlAdapter.EndRender(System.Web.UI.HtmlTextWriter) method to ensure opening and closing tag consistency.