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Failed to add web part (Exception from HRESULT: 0x80020009 (DISP_E_EXCEPTION)) exception

Posted Date: 06 Aug 2008	Resource Type: Errors and Solutions	Category: General
Author: Prasham Sabadra	Member Level: Silver
Rating:	Points: 10

The exception that we try to solve here is : Failed to add web part (Exception from HRESULT: 0x80020009 (DISP_E_EXCEPTION)) while adding any web part on SharePoint site

The various scenarios in which this may occur are:

1. We have created a SharePoint site using custom site definition and custom page layouts. On home page we have our modified content query web part. Content query web part queries to Pages library on the site. This is the scenario in our case only.

2. You developed a custom web part and obtain SPSite and SPWeb objects from current context.

Problem: We can’t add another web part on that page. Neither out of box nor custom web part. We are only getting the exception
Failed to add webpart (Exception from HRESULT: 0x80020009 (DISP_E_EXCEPTION))

Cause: We have overriding the out of box Content Query web part. In that code we are getting SPSite and SPWeb object from the current context like


using(SPSite site = SPContext.Current.Site)
{
using(SPWeb spWeb = site.OpenWeb(web))
{
	//Some code goes here
}
}

So problem lies in above two statements where we are getting SPSite and SPWeb object from the context in the using block. So as soon as this code gets executed these objects get disposed. And current site is root site. So whenever we obtain SPSite and SPWeb object from the context, these objects should not be disposed.

The objects SPSite and SPWeb obtained from the context maintain an internal list that is derived in fashion if we dispose these objects may cause SharePoint behave unpredictably. SharePoint disposes these objects itself.

For more details, visit http://blogs.msdn.com/rogerla/archive/2008/02/12/sharepoint-2007-and-wss-3-0-dispose-patterns-by-example.aspx

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