asp.net - VS2012 C# Application cannot save value? -

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the same code,application's key can saved in vs2010 after closing page,but cannot save in vs2012 

 protected void page_load(object sender, eventargs e) {     object value = application["a"]; // value = 'abc' in 2010,value = null in 2012     application["a"] = "abc"; //save value }

if closing page , , restart ,application's key exists in vs2010,but had nothing in vs2012,it seems no matter how many values set in application,if restart page, it's gone.. why ? can me ?


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