The master page class derives from the UserControl class. When the application is executing, the master page just like a child control. So we can say the master page is not a true page. “.And, when the page loads, we can notice the navigationURL of the Browser address bar is the content page's, but not the master page's.Because of that we cannot refresh a content page without refreshing master page .But we can avoid flickering with fallowing code by put one <HEAD> tag in the master page.
<meta http-equiv="Page-Enter" content="blendTrans(Duration=0)"/>
<meta http-equiv="Page-Exit" content="blendTrans(Duration=0)"/>
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