Safest way to handle null database items in VB.net - database

Question

For an object such as a DataGridView item or a data set item is the .tostring method safe to use against possible DBnull's?
The application is a mysqlconnector fed DB application which pretty much uses standard query's, but I do come across DBNull quite a bit. Keeping coding efficiency in mind, is the following safe?
Module DataCheck
Public Function SafeDataSTR(DBItem As Object) As String
If Not (IsDBNull(DBItem)) Or Not (IsNothing(DBItem)) Then
Return DBItem.ToString
Else
Return ""
End If
End Function
End Module
'Elsewhere in the galaxy....'
With tempDS.Rows.Item(0) 'tempDS is a standard dataset'
Textbox1.Text = SafeDataSTR(.Item("SupplierDetails")) 'Not necessarily a text box, just an example'
The original solution was:
If Not IsDBNull(.Item("JobDescription")) Then _
jobinfo.Job_Description = .Item("JobDescription")
Which has worked in the past but is there a better safer way to protect yourself from these?
EDIT: Sorry, would DataRow.item("Column").tostring be just as safe?
EDIT: Final Version:
Public Function SafeData_Rowfeed(row As DataRow, ItemName As String) As String
Try
If Not (IsDBNull(row.Item(ItemName))) Then
Return row.Item(ItemName).ToString
ElseIf IsNothing(ItemName) Then
Throw New IndexOutOfRangeException("Supplied Column " & ItemName & "Not found or is Nothing")
Else
Return ""
End If
Catch ex As System.ArgumentException
Console.WriteLine(ex.Message)
Return "Column Does Not Exist"
End Try
End Function

Answer 1

You could 'simplify' it a bit to
Public Function SafeDataSTR(DBItem As Object) As String
Return If(IsDBNull(DBItem), "", If(DBItem.ToString, ""))
End Function
If(DBItem.ToString, "") checks if DBItem.ToString is Nothing.
https://msdn.microsoft.com/en-us/library/bb513985.aspx
Your use of it makes it not the safest method, because the item "SupplierDetails" might not exist.

Answer 2

would DataRow.item("Column").tostring
No it wouldn't as if DataRow.item("Column") is null then calling ToString will cause a null reference exception.
What you have is the safest way of doing this.
In C# 6 and VB 14 there's the ?. syntax, but that basically compiles to the same thing you have, though it will take up one less line of code:
stringValue = DataRow.item("Column")?.ToString
Though this will always set stringValue, so if you want it to retain its current value when the column is null your existing code is still the best way to do this.