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I'm creating a web part. I need an update panel to refresh controls when using dropdowns list. I dont know why but it's missing the namespace when it shouldnt right?

using Microsoft.SharePoint;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

protected override void CreateChildControls()
    {
        updatePanel2 = new UpdatePanel();
        updatePanel2.UpdateMode = UpdatePanelUpdateMode.Conditional;

        toolPartPanel = new Panel();
        label2 = new Label();
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Can you provide the exact text of the error you're seeing? –  mason Jun 25 '13 at 14:41
    
yes of course. the error is: "The type or namespace name 'UpdatePanel' could not be found (are you missing a using directive or an assembly referece?)" –  nhenrique Jun 25 '13 at 14:43
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2 Answers

up vote 1 down vote

In your project's references, have you included a reference to System.Web.UI? Usually when it doesn't give you the option to resolve it's because the DLL reference is missing.

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I cant see System.Web.UI on the list to add references. There's a lot of System.Web..something but not UI. –  nhenrique Jun 25 '13 at 14:56
1  
Well, it may already be added--do you see it in the list of references? –  Garrison Neely Jun 25 '13 at 14:57
    
ye, i was using System.Web.UI.HtmlControls and others. Now i just added System.Web.UI and it seems fine. Thank you! It is strange that such a simple thing and Visual Studio could suggest me a namespace like it does most of the times. –  nhenrique Jun 25 '13 at 15:00
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up vote 0 down vote

Add this to the top.

using System.Web.UI

The control was not where you thought it would be. You can check the namespace in the documentation: http://msdn.microsoft.com/en-us/library/system.web.ui.updatepanel.aspx

Or if you're using Visual Studio, hover your mouse over the UpdatePanel word and it will suggest options for resolving the namespace.

share|improve this answer
    
i did that but its the same. I know about that solution, usually you just have to mouseover > resolve and add the suggested. But this one doesnt appear anything. –  nhenrique Jun 25 '13 at 14:40
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