.net working with outlook

i have such code

For Each objItem In St开发者_如何学运维artFolder.Items                    
    MessageBox.Show("to " + objItem.To)
Next

if field to is empty(empty in letter of outlook), there is no exception but the debugger shows

  objItem.To  Run-time exception thrown : System.MissingMemberException - Public member 'To' on type 'ReportItem' not found.  

how can i catch this? because any try to check property objItem.To will generate another exception

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Not knowing exactly what you are trying to do: You could test each item's type before attempting to access a property that does not exist for a particular type (in your post the item type in question is ReportItem).e.g.

For Each objItem In StartFolder.Items 
    '' I think you will need to fully qualify ReportItem with the full namespace...   
    if TypeOf obItem is ReportItem           
        MessageBox.Show("to " + objItem.To) 
Next 

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Can you do a try...catch to specifically catch the System.MissingMemberException?