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hashtable and three columns

hashtable and three columns

In my script, I'm querying a SQL Table and returning some records. The returned data set has three columns and a few rows.  

I can fill a hashtable if I'm only using two columns.  When I try to use three columns, the script breaks.

Cannot find an overload for "Add" and the argument count: "3"

this works:
foreach($item in $nachos)
    $config.Add($item.meat, $item.topping)

Does not work:
foreach($item in $nachos)
    $config.Add($item.meat, $item.topping, $item.cheese)

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