Datatable – Does Column Exist?

Need some help to create a simple logic statement to determine if a datatable contains a column with a specific name.  If the column does not exist, then I want to create it.  If the column does exist, skip the “Add” routine.  I think this can be done very easily, but I don’t know the correct syntax to use for the "IF" statement.   Thanks for the help!
If  (Column “Address” does not exist then Add it)
dt.Columns.Add("Address", typeof(string));

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 dt.Columns.Add("address", typeof(string));

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that '0' should be a ')'
dev775Author Commented:
Works perfectly - thanks!
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