need C++ syntax, data table tertiary "if null use default value"

I need the syntax for changing the last line to a tertiary "if" that checks if the data is null, uses a default value if the data is null (say 0), otherwise uses the data value.

using System.Data;
...
        public FacilityData(DataRow DRow)
        {
            SiteID = (int)DRow["SiteID"];

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