Handling nulls from database query

[Mr.No]

Hi

In VB6 you would handle null columns as follows:

Dim lcStrValue as string
Dim lcObjRcs as ADODB.Recordset
 
lcStrValue = "" &  lcObjRcs!Surname

I am now using VB.NET and picking up values from a DataRow object and getting an exception about DBNull.

How do I handle Null in the code below assuming the Surname column in the table is null.

Dim oDataRow As DataRow
 
For Each oDataRow in dtTable.Rows
    strSurname = oDataRow.Item("Surname")
Next

Thanks