c# - what to check for when a datareader might not have a particular column? -

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I am doing a redundancy test, but when I am doing, I'm getting an exception to the limit: 

  If (myReader ["column1"]! = Null) {}

under certain conditions that column will not exist, why not a redundant investigation doing work?

Check to see if the column already exists 

  For (int i = 0; i

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