[RESOLVED] datagrid text box search

I have a text box setup to filter a datagrid. Work just fine, but if I search for something that is not there (empty results) it comes back with an error

"Object reference not set to an instance of an object."

on the bolded line. How to fix that error?

Code:

---

Private Sub LicensesBindingSource_CurrentChanged(ByVal sender As Object,
                                          ByVal e As EventArgs) Handles LicensesBindingSource.CurrentChanged

        'Make sure the grid has columns, which it won't when the BindingSource is first bound.

        If Me.DataGridView1.ColumnCount > 0 Then
            'Get the underlying DataRow that corresponds to the selected row in the grid.
            Dim row As DataRow = DirectCast(Me.LicensesBindingSource.Current, DataRowView).Row
            'Only allow editing if the row is detached (created but not yet added to the table)
            'or added (added to the table since the last AcceptChanges call).
            Me.DataGridView1.Columns(0).ReadOnly = Not (row.RowState = DataRowState.Detached OrElse
                                                    row.RowState = DataRowState.Added)

        End If
    End Sub

---

Test for nothing before casting like:-

vbnet Code:

If Me.LicensesBindingSource.Current IsNot Nothing Then
            Dim row As DataRow = DirectCast(Me.LicensesBindingSource.Current, DataRowView).Row
            'Only allow editing if the row is detached (created but not yet added to the table)
            'or added (added to the table since the last AcceptChanges call).
            Me.DataGridView1.Columns(0).ReadOnly = Not (row.RowState = DataRowState.Detached OrElse
                                                    row.RowState = DataRowState.Added)
End If

perfect, thank you Niya, I was close. I had that but was checking for the wrong item.