Question

I want to generate some formatted output of data retrieved from an MS-Access database and stored in a DataTable object/variable, myDataTable. However, some of the fields in myDataTable cotain dbNull data. So, the following VB.net code snippet will give errors if the value of any of the fields lastname, intials, or sID is dbNull.

   dim myDataTable as DataTable    dim tmpStr as String    dim sID as Integer = 1     ...    myDataTable = myTableAdapter.GetData() ' Reads the data from MS-Access table    ...     For Each myItem As DataRow In myDataTable.Rows      tmpStr = nameItem('lastname') + ' ' + nameItem('initials')      If myItem('sID')=sID Then         ' Do something     End If      ' print tmpStr     Next 

So, how do i get the above code to work when the fields may contain dbNull without having to check each time if the data is dbNull as in this question?

Answer 1

The only way that i know of is to test for it, you can do a combined if though to make it easy.

If NOT IsDbNull(myItem('sID')) AndAlso myItem('sID') = sId Then    'Do success ELSE    'Failure End If 

I wrote in VB as that is what it looks like you need, even though you mixed languages.

Edit

Cleaned up to use IsDbNull to make it more readable