Property Feature For Comparing DateTime

[Stephen]

Hi,

I dont know whether I am doing this correctly or not. I want some procedure
to fire when the time b/w the last and the current request is > 15 min
I declared a global variable (txtPrev as string) and set it initially to
datetime.now (tostring) and the clicked event of a button compare that
datetime.now - prevtime.. but the global variable has nothing in it... why?
I thought it would be set when declared globally for some reason its null
(either my understanding is totally wrong or something is screwed up

If newDateTime.Now .Subtract(DateT ime.Parse(txtPr ev)).TotalMinut es > 2 Then
<-- error out here

else

end if

I TRY THIS TOO... BUT DOES NOT WORK EITHER

I have no understanding of Property but thought I would try... please do
help me in understanding this
Public Property X() As DateTime
Get
Return X

End Get

Set(ByVal Value As DateTime)
X = Value

End Set

End Property

Suppose during page load I do this t_PrevTime = X.Now

and then while comparing at the clicked_event why does it take the value of
#12.00 AM#
If prevDateTime.No w.Subtract(X).T otalMinutes > 2 Then <--- thought it
should set X to X.Now

else

Endif
Please advice... I feel as if I am doing this in worst possible way, if
there is a better way please do let me know.
Thanks in Advance,
Stephen

[albert braun]

here's an idea

in your Page_Load method, cache some object with a sliding expiration
of 15 minutes.

then, on subsequent loads of the page, simply access that cache item to
keep it "fresh"

so, something like this (i have not tested this code - caveat emptor):

protected void Page_Load(objec t sender, EventArgs e)
{
System.Web.Cach ing.CacheItemRe movedCallback onRemoveCallbac k =
new
System.Web.Cach ing.CacheItemRe movedCallback(m yCallbackHandle r);

if (!IsPostBack)
{
Cache.Add("x", "x", null, DateTime.MaxVal ue,
new TimeSpan(0, 15, 0),
System.Web.Cach ing.CacheItemPr iority.Normal,
onRemoveCallbac k);
}
else
{
// just access the cached item to keep it "alive" in the
cache, and
// therefore not provoke the firing of the onRemoveCallbac k
string y = (string)Cache["x"];
}

}

public void myCallbackHandl er(String k, Object v,
CacheItemRemove dReason r)
{
// do your processing here for the case
// where the page has not been accessed for the last 15 mins
}

[Stephen]

Thanks Albert,
will work with the suggestion
Thanks,
stephen

"albert braun" <bc************ ***********@yah oo.com> wrote in message
news:11******** **************@ o13g2000cwo.goo glegroups.com.. .

here's an idea

in your Page_Load method, cache some object with a sliding expiration
of 15 minutes.

then, on subsequent loads of the page, simply access that cache item to
keep it "fresh"

so, something like this (i have not tested this code - caveat emptor):

protected void Page_Load(objec t sender, EventArgs e)
{
System.Web.Cach ing.CacheItemRe movedCallback onRemoveCallbac k =
new
System.Web.Cach ing.CacheItemRe movedCallback(m yCallbackHandle r);

if (!IsPostBack)
{
Cache.Add("x", "x", null, DateTime.MaxVal ue,
new TimeSpan(0, 15, 0),
System.Web.Cach ing.CacheItemPr iority.Normal,
onRemoveCallbac k);
}
else
{
// just access the cached item to keep it "alive" in the
cache, and
// therefore not provoke the firing of the onRemoveCallbac k
string y = (string)Cache["x"];
}

}

public void myCallbackHandl er(String k, Object v,
CacheItemRemove dReason r)
{
// do your processing here for the case
// where the page has not been accessed for the last 15 mins
}