>I believe you can test for DBNull
>
>if(oDataSet.Tables[0].Rows[0]["dDate"]==DBNull)

The original issue was about the ability that a VFP client could pass an empty date as a parameter to the Web Service. I initially assumed it was going through the Web Service. As the Web Service is in .NET, I wanted to detect that. But, it turns out that if a Web Service as a date parameter, the call to such a method would not be accepted from a VFP client if an empty date is passed.