I know how to create a new module and install it. But how can I add a web user control to an existing module like Blog module in source code development level? The Blog module has 5 user controls, what if I want to add another user control? Is there any tutorial or instruction about it?

Thanks in advance for any help!

Brent

Antonio,
Thanks very much for your quick reply!

Here is what I did:

1. In visual studio right click on DesktopModules\Blog to add a Web User Control named "TestUserControl.ascx".
In the design mode I just added several labels and text boxes. The first line of the source is as follows:

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="TestUserControl.ascx.vb" Inherits="DesktopModules_Blog_TestUserControl" %>

However I didn't want to have a code behind file as I just wanted to have the look and feel of the added web user control,
so I took out "CodeFile="TestUserControl.vb"". And when compiling it complained about "DesktopModules_Blog_TestUserControl". So I changed it to the following statement.

<%@ Control Language="VB" AutoEventWireup="false" Inherits="DotNetNuke.Modules.Blog.ViewBlog" %>

2. Added the following section to DNN_Blog.dnn

<module>
          <friendlyname>Test_UserControl</friendlyname>
          <cachetime>0</cachetime>
          <controls>
            <control>
              <title>Test User Control</title>
              <src>DesktopModules/Blog/TestUserControl.ascx</src>
              <type>View</type>
            </control>
          </controls>
</module>

3. Package all the relatives files into a zip file

4. In DotNetNuke installed the Blog module that I just zipped. In a test page I added the Blog module, it displayed all the five original user controls, but it puked about my user control as follows:

Error: is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Blog.ViewBlog.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---

So what would be the correct procedure to add my own web user control to the existing Blog module?

Thanks,
Brent

To be clear, the reason why you are getting a run-time error is because you are referencing the ViewBlog class (Inherits="DotNetNuke.Modules.Blog.ViewBlog"). That class will be looking for its user controls and try to inject data and modify their properties, but since your file(Test_blah.ascx) does not have any controls, then it throws the error you are seeing.

I hope this makes sense.