Hi
I am baffled with some stuff i am noticing in VS 2005.
Please let me know if i am doing something incorrect.

Here are a few things:

Issue 1:

1. I created a  base user control called MYUserControlBase.
2. I added a property called MYProperty with internal modifier.
3. I created another user control called MyUserControl which inherits MYUserCOntrolBase.
4. Now, when i try to access the property MYProperty (by typing this.) in MyUserCOntrol, i notice the intellisense does not display MyProperty.
5. Also, when i type in this and try to access NamingContainer property in MyUserControl i cannot seem to access it, but if i change the inheritance page to UserControl instead of MyUserCOntrol i can access it?

Is this expected?

Issue 2:

1. I have added a new WebForm called WebForm1.aspx.
2. I have dragged the user control that i have created in the above steps on to this WebForm1.
3. Now, in the usercontrol, MyUserControl.ascx, i typed:
(()this.Page) and tried to cast it to the page, but i can't seem to do it.

Is this also expected?

Issue 3:

1. I have added namespace Test to a class and tried building it, i get this error:

Error 3 Make sure that the class defined in this code file matches the 'inherits' attribute, and that it extends the correct base class (e.g. Page or UserControl). C:\Projects\MyProject\WebUserControl.ascx.cs 16 33 C:\...\

Please let me know if you have any answers.
Thanks.

I can help answer a few questions:

Issue #1: The reason the property in the base class isn't being seen by the sub-class is because the property was defined with an "internal" accessor instead of protected.  Classes in the app_code directory are now compiled in a separate assembly from the user-control -- so internal members can't be accessed (since these only work within the same assembly).  Changing the accessor to protected will fix this.

Issue #2: In general I'd recommend not doing this approach (since you end up with a control that is in a page container having intimate knowledge of the page -- which breaks some encapsulation rules).  If you do want to-do this, what I'd recommend is declaring a page base class in your app_code directory for your page -- and then having the user-control cast against this when accessing the page.  That way the page contract is explict, and you can re-use the control across multiple page.

Issue #3: The problem you have here is that you updated the namespace in only one place (the code-behind file).  You also need to go into the .aspx file and modify the "inherits" attribute to qualify the namespace (for example: inherits="MyNamespace.MyPageClass").

Hope this helps,

Scott

Hi Scott
It is a pleasure receiving a response from you.  Thank you.

Issues 1 and 3 are good, understood.
Issue 2 i got it working but i am wondering what are the advantages of this approach over the normal one.

And you say:

::Classes in the app_code directory are now compiled in a separate assembly from the ::user-control

Where is the assembly?
Thanks.

Hi Scott

Extending the example in Issue 2:

1. I have added a new WebForm called WebForm1.aspx.
2. I have dragged the user control (UC1.ascx) on to this WebForm1.
3. Then dragged another UC2.ascx onto WebForm1.aspx.
4. UC1 is on left and UC2 is on right side of WebForm, both use III party controls which have ajax capable functionality built in.
5. User selects some fields in UC1 and then makes selections in UC2 when we call certain Callback events decalared in UC2.ascx.cs. At this point, when the callback event in UC2 is called/triggered, if i want to access the values of fields in UC1, how to do. In .Net 1.1 i would do it like this:

In UC2.ascx.cs:
 ((ASP.WebForm1)this.Page)

But this changed in .Net 2.0. Please let me know if you have any suggestions.
Thanks.

Hi Sailu,

If I understand you right, you want usercontrol1 to be able to access the values of usercontrol2?

You could do this by doing two steps:

1) Add a <%@ Reference control="usercontrol.ascx" %> reference in usercontrol1 that points to the .ascx file of usercontrol2.  This should be the first line of the usercontrol1.ascx file.  This will then allow usercontrol1 to cast and access a usercontrol2 type.

2) Then within the code of usercontrol1 you could write code like:

usercontrol2 uc2 = (usercontrol2) this.Page.FindControl("usercontrol1");

string foo = uc2.property;

Hope this helps,

Scott