Datareader - checking for system,indexOutOfRangeException

I have a data reader that has this code

while (dr.Read())
                {
 if (Convert.ToInt16(dr[0]) > 0) {     
                    recordsReturned = 1;
                    }

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This works fine if results are returned, but if the data reader has no results, it breaks
I tried using .HasRows, but it always has rows for some reason

Anyway, what code do i need to check for this out of range exception?
websssAsked:
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Daniel Van Der WerkenIndependent ConsultantCommented:
Check for dbNull:

while (dr.Read())
 {
 if (r[0] != DBNull.value && Convert.ToInt16(dr[0]) > 0) 
   {     
      recordsReturned = 1;
   }
}

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