Is it possible to customize error message "Column does not allow nulls" in a datatable? - vb.net

Question

I have a form with controls bound to a datatable in VB.net.
When keeping empty a field that should be filled, I'm receiving the error message : Column does not allow nulls.
Is it possible to replace this error message string by another one ?

Answer 1

There are a lot of ways when it comes to error handling.
You could get your code to throw a custom error alert:
This will throw an alert with the text: NullCollumContent
Try
'your code here
Catch ex As Exception
Throw New System.Exception("NullCollomContent")
End Try
Also as K3rnel31 explained:
This will just show a simple message box to the user
Try
'your code here
Catch ex As Exception
msgbox("error message here")
End Try
You could also use If statements to check the string:
This if checks the length of the string and checks if its equal to 0:
If Not yourString.Length = 0 Then
'your code here
else
'some error handling here
End If
This if checks if your string is equal to "" which basically means an empty string:
If Not yourString Is "" Then
'your code here
Else
'some error handling here
End If

Answer 2

Try
'your code here to the datatable
Catch ex As Exception
msgbox("changed error string here")
End Try

Answer 3

Thank you all for your answers but that's not really my problem.
Everything is about DataTable Object.
My problem is that I don't know where the exception is raised.
Let me explain.
Assume Column X has AllowDBNull property to false
And I'm not creating manually a new row that I add to the table
Which means I'm not using such code:
Dim NewRow as DataRow = DataTable.NewRow
NewRom.Item("X") = textbox1.text
DataTable.rows.add(NewRow)
If I was using that code, I would have indeed added the Try/Catch
Dim NewRow as DataRow = DataTable.NewRow
NewRom.Item("X") = textbox1.text
try
DataTable.rows.add(NewRow)
catch Ex as Exception
...
end try
I'm using a DataNavigator which adds in a hidden manner the new row to be added to the table.
So, if Column X is empty, he raises by himself the error. It's not an Exception to be handled. It's an error displayed at run time. Programmatically speaking, nothing went wrong at run time. It seems like DataTable object is designed with this feature and default Error Message.
I hope it's clear now.