System.nullreferenceexception: 'object reference not set to an instance of an object.' dt fue nothing.

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System.NullReferenceException: 'Object reference not set to an instance of an object.' dt fue Nothing. en visual basic

VB

Try
            Dim lc As New LClientes

            Dim dt As DataTable = lc.Consultar(TxtNumId.Text)

            Dim dr As DataRow = dt.Rows.Item(0)

            TxtIdCliente.Text = dr.Item("ID_CLIENTE")
            TxtNombre.Text = dr.Item("NOMBRE")
            TxtTelefono.Text = dr.Item("TELEFONO")
        Catch ex As Exception
            MsgBox("El cliente no existe")
        End Try

What I have tried:

revise el codigo con el desarrollador del software original

Posted 18-Jul-23 5:05am

augusto S. Hernandez

Updated 18-Jul-23 5:38am

Andre Oosthuizen

v2

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Andre Oosthuizen 18-Jul-23 11:10am

This is an english site, I have no idea what 'revise el codigo con el desarrollador del software original' means.

2 solutions

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Ralf Meier · Answer 1 · 2023-07-18T05:24:00

this Execption means that you have declared a DataTable but there is nothing in it what could be referenced.
To solve this problem it's up to you because we don't have your Software and also not your Data - but : inside your development-system you have the Debugger which could show you what exactly happens ...

Richard MacCutchan · Answer 2 · 2023-07-18T05:27:00

Solution 2

VB

Dim dt As DataTable = lc.Consultar(TxtNumId.Text)

If dt is null then it means that the call to lc.Consultar is not returning anything. You will need to use the debugger to find out why.

Posted 18-Jul-23 5:27am

Richard MacCutchan