I am starting to learn web development using VWD 2008 express. Here is a simple situation in global.asax. I want to display a user count on my page and I am using this code:

This

Application("userCount") += 1; 

should be:

Application.Lock()
int cnt = (int)Application["userCount"];
Application["userCount"] = cnt + 1;
Application.UnLock();

public void Application_Start(object sender, EventArgs e)
{
    Application("userCount") = 0;
}

public void Application_End(object sender, EventArgs e)
{
}

public void Application_Error(object sender, EventArgs e)
{
}

public void Session_Start(object sender, EventArgs e)
{
    Application("userCount") += 1;
}

public void Session_End(object sender, EventArgs e)
{
    Application("userCount") -= 1;
}

joteke, your solution worked. Thanks a bunch. 

I understand your code but I was following a learning video that used this code: "Application("userCount") += 1; " and I wonder how it worked for them? Could it be a difference between VWD 2005 express and VWD 2008 express ?  I am using VWD 2008 express but the learning video is taught using VWD 2005 express. 

JZoerman, your solution is what I tried in the first place and that is what gave me the errors.

JZoerman:

Application("userCount") += 1;

Florida:

joteke, your solution worked. Thanks a bunch. 

I understand your code but I was following a learning video that used this code: "Application("userCount") += 1; " and I wonder how it worked for them? Could it be a difference between VWD 2005 express and VWD 2008 express ?  I am using VWD 2008 express but the learning video is taught using VWD 2005 express. 

I don't believe the approach in the video it works, since there are 2 errors in that approach.First was that in C# one uses [...]'s to indexing, VB.NET uses (...)'s. Second is that Application collections Item property (which you index to) is typed as object and accumulating integer to it doesn't make sense (e.g C# is strict about types). Again, that would work in VB (although IN VS2005 and 2008 syntax checking is stricter by default)

Ok cool, I gotcha.  I used C#, but the instructional video was using VB.  I like to try something a bit different rather than just blindly follow instructions from the video.  Now I learned a lot more than what was being taught on the video. Thanks to you sir.  You are the best.