http://vstoolsforum.com/blogs/vbnet/default.aspxNotes, Tricks and Tips on VB.NETenCommunityServer 2007 SP2 (Build: 20611.960)http://vstoolsforum.com/blogs/vbnet/archive/2007/06/23/retrieving-a-connection-string-from-app-config.aspx#1165Fri, 25 Jul 2008 20:25:05 GMT05d3ee43-09e1-4c21-9d53-64ecaf1acc4f:1165Antonio<p>I had the same problem, but it's just a matter of add the reference of System.Configuration using the Add references menu.</p> <img src="http://vstoolsforum.com/aggbug.aspx?PostID=1165" width="1" height="1">http://vstoolsforum.com/blogs/vbnet/archive/2007/08/17/how-to-keep-an-mdi-form-from-opening-twice.aspx#578Fri, 24 Aug 2007 11:38:11 GMT05d3ee43-09e1-4c21-9d53-64ecaf1acc4f:578Steve Gray<p>You pass in the form that you want to open (frm), f is a generic form object. We loop through all the forms in the 'mdiChildren' collection and see if this frm is open. 'F' represents the forms in the 'mdichildren' collection. </p> <img src="http://vstoolsforum.com/aggbug.aspx?PostID=578" width="1" height="1">http://vstoolsforum.com/blogs/vbnet/archive/2007/08/17/how-to-keep-an-mdi-form-from-opening-twice.aspx#577Fri, 24 Aug 2007 08:41:34 GMT05d3ee43-09e1-4c21-9d53-64ecaf1acc4f:577may<p>what is f in this context?</p> <img src="http://vstoolsforum.com/aggbug.aspx?PostID=577" width="1" height="1">