c# - determine if a field is returned from a datareader -

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I'm dynamically selecting a table to select and a field that is not present on all tables. Inside the reader, how can I see if this area is present in the collection or not?

I am using it, but it only determines whether it is zero ... No, whether it exists or not: 

  if (myReader .GetValue (myReader.GetOrdinal ("prepay")! = DB.NLL.value) myModel.PrePay = myReader.GetBoolean (myReader.GetOrdinal ("prepay");    
 Take a look at 
 
 (MyReader is a SqlDataReader to handle).

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