object reference not set to an instance of an object error showing

Question

Whenever I run the following code it shows the error as "object reference not set to an instance of an object" : (This codes change the value of DatagridViewComboBox as per other DatagridViewComboBox in same row and sharing same databse table.)

Private Sub dgv1_CellValueChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgv1.CellValueChanged

    Try

        Dim currentrowindex As Integer = dgv1.CurrentRow.Index
        Dim obj As Object = dgv1.CurrentCell.Value           
        Me.dgv1(1, currentrowindex).Value = obj
        Me.dgv1(2, currentrowindex).Value = obj
    Catch ex As Exception
        MsgBox(ex.Message)

    End Try
End Sub



Private Sub dgv1_CurrentCellDirtyStateChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles dgv1.CurrentCellDirtyStateChanged
   dgv1.CommitEdit(DataGridViewDataErrorContexts.Commit)

End Sub

Please tell me how can I fix this error ???

For the possible reasons of a NullReferenceException, see this post: stackoverflow.com/questions/4660142/…. That said, I suggest to run your application in Debug mode and check if any of your object references are Nothing. A candidate is dgv1.CurrentRow, another dgv1.CurrentCell. — Markus
– Markus, Commented Mar 8, 2014 at 6:45
Use a debugger to find the value which is Null. I suspect dgv1 is not initialized. — PMF
– PMF, Commented Mar 8, 2014 at 6:46
thanks I've done this: Private Sub datagridview2_cellvaluechanged(ByVal sender As Object, ByVal e As DataGridViewCellEventArgs) Try Dim currentrowindex As Integer = dgv2.CurrentRow.Index Dim obj As Object = dgv2.CurrentCell.Value ' we can take STRING or OBJECT var is mandatory Me.dgv2(4, currentrowindex).Value = obj Me.dgv2(5, currentrowindex).Value = obj Catch ex As Exception MsgBox(ex.Message) End Try End Sub handler in form load: AddHandler dgv2.CellValueChanged,AddressOf datagridview2_cellvaluechanged — user3364608
– user3364608, Commented Mar 9, 2014 at 9:59

user3364608 · Accepted Answer · 2014-03-09 10:04:27Z

0

thanks to everyone now I have done this as : Private Sub datagridview2_cellvaluechanged(ByVal sender As Object, ByVal e As DataGridViewCellEventArgs)

    Try
        Dim currentrowindex As Integer = dgv2.CurrentRow.Index
        Dim obj As Object = dgv2.CurrentCell.Value   ' we can take STRING or OBJECT var is mandatory

        Me.dgv2(4, currentrowindex).Value = obj
        Me.dgv2(5, currentrowindex).Value = obj
    Catch ex As Exception
        MsgBox(ex.Message)
    End Try

End Sub

and add a handler in form load : AddHandler dgv2.CellValueChanged, AddressOf datagridview2_cellvaluechanged

answered Mar 9, 2014 at 10:04

user3364608

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