Compiler Error Message: CS0201: Only assignment, call, increment,
decrement, and new object expressions can be used as a statement

And:
(int)Application["TotalPlayings"]++;
Makes no sense.

int iCount = ((int)Application["TotalPlayings"])++;
Response.Write("count = " + iCount);  //makes sense :-)
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It would be faster (and safer) to declare a static int field in some
class (Global.asax, perhaps), and use Interlocked.Increment to be
thread safe.

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Couldn't understand very much.Instead "Application[""]" with  "static
int"?Sound very well,but how to use it in other pages?

//http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iissdk/html/7b41355f-5050-4b2b-ac1c-d10dc206b46a.asp
Application.Lock();
if (Application["hitCount"] == null)
{
  Application["hitCount"] = 1;
}
else
{

  Application["hitCount"]= ((int)Application["hitCount"])+1;

}
Application.UnLock();

if (Application["hitCount2"] == null)
{
  Application["hitCount2"] = 1;
}
else
{
    //use Interlocked.Increment Method (thanks to Scott Allen for introducing
the idea)     //http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemthreadinginterlockedclasstopic.asp
    int iCount2 = (int)Application["hitCount2"];
    Application["hitCount2"]=Interlocked.Increment(ref iCount2);
}
Response.Write ("Application count= " + Application["hitCount"]);
Response.Write ("Application count2= " + Application["hitCount2"]);
//How many programmers does it take to increment an application variable?  :-)

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It would look like:

using System.Threading;

public class HitCounter
{
    static int _counter;

    public static int IncrementCounter()
    {
        return Interlocked.Increment(ref _counter);
    }

    public static int GetCounter()
    {
        return _counter;
    }
}

You could use it like:

int x = HitCounter.IncrementCounter();

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Application["TotalPlayings"] returns an object,
(int)Application["TotalPlayings"] unboxes that object and returns
  an int as a *copy* of that value,
When you use the "++" operator, you will use that on that copy,
not on the original. So the original Application["TotalPlayings"] is
not updated.
Plus you might have a precedence problem: what would be evaluated
first: the (int) or the ++?

Hans Kesting

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