DataGridView - выделить строку правой кнопкой мыши

   Private Sub DataGridView1_CellMouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles DataGridView1.CellMouseClick
        If e.Button = Windows.Forms.MouseButtons.Right Then
            DataGridView1.CurrentCell = DataGridView1(e.ColumnIndex, e.RowIndex)
            DataGridView1.CurrentRow.Selected = True
        End If
 
    End Sub

    Private Sub DataGridView1_CellMouseDown(ByVal sender As Object, ByVal e As DataGridViewCellMouseEventArgs) Handles DataGridView1.CellMouseDown
        If ((e.RowIndex <> -1) AndAlso (e.ColumnIndex <> -1)) Then
            If (e.Button = MouseButtons.Right) Then
                Dim clickedCell As DataGridViewCell = CType(sender, DataGridView).Rows(e.RowIndex).Cells(e.ColumnIndex)
                Me.DataGridView1.CurrentCell = clickedCell
                Dim relativeMousePosition = DataGridView1.PointToClient(Cursor.Position)
                Me.ContextMenuStrip1.Show(DataGridView1, relativeMousePosition)
            End If
        End If
    End Sub