Hi Alan!
Thanks for your help, but I'm still missing something. Following is my block of code exactly as in my project:
Dim dtFoxProNull As DateTime = DateTime.Parse("12/10/1899")
For Each tr_chkdate As DataRow In DSfatrans.Tables("fatrans").Rows
If (DateTime.Parse(dr("tr_chkdate").ToString()) = dtFoxProNull) Then
dr("tr_chkdate") = DBNull.Value
End If
Next
DSfatrans.AcceptChanges()

When I run this I get the following error: "Object reference not set to instance of an object."
tr_chkdate is a column in my grid that will often be blank. Currently it's displaying a default date of 12/10/1899 rather than a null date.