tolong gan ane mau ambil data dari datagridview satu row ke textbox

ini koding ane, tapi ane kena error gini

Private Sub DataGridView1_CurrentCellChanged(sender As Object, e As EventArgs) Handles DataGridView1.CurrentCellChanged

Dim dColums(0) As DataColumn
dColums(0) = dsetmember.Tables("member").Columns(0)
dsetmember.Tables("member").PrimaryKey = dColums

'MessageBox.Show(DataGridView1.CurrentRow.Index, 1)
If DataGridView1.CurrentRow.Index = -1 Then
txtNamaMember.Text = ""
txtKodeMember.Text = ""
txtNoHP.Text = ""
Else
Dim dr As DataRow = dsetmember.Tables("member").Rows.Find(DataGridView1.Item(DataGridView1.CurrentRow.Index, 0))
txtKodeMember.Text = dr(0)
End If

End Sub

error gini :
nullreferenceException was unhandled Object reference not set to an instance of an object.

thc b4