Question

My code block is below. As it turns out, rdrCurrentRate.GetString(12) is a null value, but the code block throws an error. “Data is Null. This method or property cannot be called on Null values.”

My intention is to write “if rdrCurrentRate.GetString(12) is NOT NULL, then sCurrentRateType = rdrCurrentRate.GetString(12)”

What am I missing here?

                If Not String.IsNullOrEmpty(rdrCurrentRate.GetString(12)) Then
                    sCurrentRateType = rdrCurrentRate.GetString(12)
                End If

Answer 1

You probably want to use the IsDBNull method instead:

If Not rdrCurrentRate.IsDBNull(12) Then
    sCurrentRateType = rdrCurrentRate.GetString(12)
End If

Null values are not represented by null in the data reader, but instead of a special DBNull value. The IsDBNull method will check if the column represents such a value.