control caching based on value

[Steve]

Hello. I'm trying to figure out how to cache a user control based on a given
value. Here's my scenario:

* I have 3 properties in a user control which I set programatically in my
aspx.vb page. I want to cache the control based on one of the properties.
It's called "Category"
* I get the category through a variety of ways - either through session or
the database. It's never in the querystring or a field on the screen.

I can get the control to cache the first Category value, but not any others.
The next time I get an "Object Not Found" exception when I try to set the
properties.

Any ideas how to do this?

Thanks for your help in advance!
--
Steve

[Ken Cox - Microsoft MVP]

Are you using ASP.NET 2? If so, you should be able to use the
OutputCacheParameters.VaryByCustom Property to handle that scenario:

http://msdn2.microsoft.com/en-us/lib...om(VS.80).aspx

Ken
Microsoft MVP [ASP.NET]
"Steve" <sm*******@newsgroup.nospam> wrote in message
news:C8**********************************@microsof t.com...

Hello. I'm trying to figure out how to cache a user control based on a
given
value. Here's my scenario:

* I have 3 properties in a user control which I set programatically in my
aspx.vb page. I want to cache the control based on one of the properties.
It's called "Category"
* I get the category through a variety of ways - either through session or
the database. It's never in the querystring or a field on the screen.

I can get the control to cache the first Category value, but not any
others.
The next time I get an "Object Not Found" exception when I try to set the
properties.

Any ideas how to do this?

Thanks for your help in advance!
--
Steve

[Steve]

Thanks, Ken, for your reply. I am using 2.0. I still think I'm missing
something here. Here's how I have it coded..

My .ascx file:

<%@ OutputCache Duration="60" VaryByParam="None" VaryByCustom="category" %>

My aspx.vb file:

Response.Cache.SetVaryByCustom(category.ToString)

'Setup the main edit screen
myControl.Category = category.ToString
myControl.OtherProperty1 = "abc"
myControl.OtherProperty2 = def"

My Global.asax file:

Public Overrides Function GetVaryByCustomString(ByVal context As
System.Web.HttpContext, ByVal custom As String) As String
Return MyBase.GetVaryByCustomString(context, custom)
End Function
I always get and "Object reference not set to an instance of an object. "
error on the line myControl.Category = category.ToString.

What am I missing here?

Thanks for your help!

Steve

"Ken Cox - Microsoft MVP" wrote:

Are you using ASP.NET 2? If so, you should be able to use the
OutputCacheParameters.VaryByCustom Property to handle that scenario:

http://msdn2.microsoft.com/en-us/lib...om(VS.80).aspx

Ken
Microsoft MVP [ASP.NET]
"Steve" <sm*******@newsgroup.nospam> wrote in message
news:C8**********************************@microsof t.com...

Hello. I'm trying to figure out how to cache a user control based on a
given
value. Here's my scenario:

* I have 3 properties in a user control which I set programatically in my
aspx.vb page. I want to cache the control based on one of the properties.
It's called "Category"
* I get the category through a variety of ways - either through session or
the database. It's never in the querystring or a field on the screen.

I can get the control to cache the first Category value, but not any
others.
The next time I get an "Object Not Found" exception when I try to set the
properties.

Any ideas how to do this?

Thanks for your help in advance!
--
Steve