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Excel file --- add references..

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I want to read data from an Excel file. I have read some example from internet about how to extract data from Excel file and I found this link is quite useful and look similar to my problem that I was facing.

It asked to add a reference on it ... and I have added the reference, and I checked from the solution Explorer there and I have seen that the reference I have added does exist... but the problem is from the References folder, and expand the node, there are a few things there such as Excel, Microsoft.Office.Core, System and so on...
The problem I am encountering is the excel is having an exclamation mark... supposedly it shouldn't have an exclamation mark and it claims that the project cannot be viewed in the object browser because it is unavailable or not yet built...... what should I do??

Can anybody tell me what should I do????
thanks!!
Aug 6 '07 #1
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