How to clear Datagridview

There is two ways to clear rows in datagridview :



1- When the datagridview is not assigned to Datasource :

            DataGridView1.Rows.Clear()

2- When the datagridview isassigned to Datasource :

           DataGridView1.DataSource = Nothing
           DataGridView1.DataMember = Nothing
           DataGridView1.Refresh()