Setting a parent page's label control text from a user control

I have a .net 2.0 site where I'll have the same form for user input on a number of pages. I plan on using a user control for this.

The catch is if the user doesn't input the data properly I want to write the error message to a label control on the parent page, not in the user control. This is because the design for each parent page is different enough that we need to display the error message in a different part of the page.

I've seen a couple of websites that mention using a base page that all my pages could inherit from to have a user control interact with the parent page. This blog post is one of them. 

Is this really the best way to do this?
I'm not familiar with a base page class. Is there any problem with pages inheriting from a custom base page class while at the same time using master pages?

Any other thoughts?

1/17/2008 10:28:59 PM 91979 articles. 4 followers. Follow

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You definately could do that.  If you do I would create a ControlBase class that inherits from System.Web.UI.UserControl.
Then create your control and replace the base class in each UserControl that you create with ControlBase.
Of course, for this to work you would have to name the label on each page the same.

Ie.  This would be your ControlBase Class: 

public class ControlBase : System.Web.UI.UserControl
	public Label ParentPageLabel
            Label lblParentPageLabel = ( Label ) Page.FindControl ( "lblParentPage" );
            return lblParentPageLabel;


This would be your userControl:

public partial class UserControls_WebUserControl : ControlBase
    protected void Page_Load(object sender, EventArgs e)
        ParentPageLabel.Text = "Text from a user control";


This would be your parent page 

<form id="form1" runat="server">
	<asp:Label ID="lblParentPage" runat="server" /><br />
	<uc1:WebUserControl ID="WebUserControl1" runat="server" />
If everything happens for a reason what is the reason for this error?
1/18/2008 12:53:34 AM

Try this in the above code...

Label lblParentPageLabel = ( Label ) Page.FindControl ( "lblParentPage" ).ClientId;

Vishal Khanna
.NET Interviews & FAQs @

Click Mark as Answer if the reply helped you.
1/18/2008 5:32:30 AM

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