Conversion from type 'DBNull' to type 'String' is not valid. visualbasic 2008

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Private Sub NavigateRecords()

        txttransactionnumber.Text = ds.Tables("tblaccounts").Rows(inc).Item(0)
        txtdate.Text = ds.Tables("tblaccounts").Rows(inc).Item(1)
        txtamount.Text = ds.Tables("tblaccounts").Rows(inc).Item(2)
        txtaccounttitle.Text = ds.Tables("tblaccounts").Rows(inc).Item(3)
        txtnormalbalance.Text = ds.Tables("tblaccounts").Rows(inc).Item(4)
        txtdescription.Text = ds.Tables("tblaccounts").Rows(inc).Item(5)
        txtfinancialstatement.Text = ds.Tables("tblaccounts").Rows(inc).Item(6)
        txtcompanyname.Text = ds.Tables("tblaccounts").Rows(inc).Item(7)
        txtcareof.Text = ds.Tables("tblaccounts").Rows(inc).Item(8)
        txtduedate.Text = ds.Tables("tblaccounts").Rows(inc).Item(9)

    End Sub

Posted 6-Mar-15 6:01am

Member 11475835

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Member 11475835 6-Mar-15 12:01pm

txttransactionnumber.Text = ds.Tables("tblaccounts").Rows(inc).Item(0)
this is the line where the warning pops up

PIEBALDconsult 6-Mar-15 12:09pm

The simplest thing to do in this case is to add .ToString() to each Item .

Member 11475835 6-Mar-15 12:15pm

thank you... it is now working

2 solutions

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Abhinav S · Answer 1 · 2015-03-06T06:09:00

Solution 1

The database is missing a value, and thus, you will get a DBNull[^] back.

Check for nulls.

If Not DbNull.Value.Equals(ds.Tables("tblaccounts").Rows(inc).Item(0)) Then
    Return ds.Tables("tblaccounts").Rows(inc).Item(0)
 Else
    Return Nothing
 End If

Posted 6-Mar-15 6:09am

Abhinav S

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Member 11475835 6-Mar-15 12:15pm

thank you

Peter Leow · Answer 2 · 2015-03-06T06:10:00

Solution 2

Refer: Conversion from type 'DBNull' to type 'String' is not valid.[^]

Posted 6-Mar-15 6:10am

Peter Leow

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Member 11475835 6-Mar-15 12:15pm

thank you