Getting row number in a DataGridView

You can simply use RowIndex on the current cell:

var row = dataGridView1.CurrentCell.RowIndex;

this one works fine .

Private Sub DataGridView1_RowPrePaint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewRowPrePaintEventArgs) Handles DataGridView1.RowPrePaint

If e.RowIndex >= 0 Then
        Me.DataGridView1.Rows(e.RowIndex).Cells(0).Value = e.RowIndex + 1
    End If
End Sub