Change backcolor of selected row in datagridview on mouseover:

Private Sub dgvPrjDwgs_CellMouseEnter(sender As Object, e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgvPrjDwgs.CellMouseEnter
        dgvPrjDwgs.RowsDefaultCellStyle.SelectionBackColor = Color.BlanchedAlmond
        If e.RowIndex > -1 Then
            dgvPrjDwgs.Rows(e.RowIndex).Selected = True
        End If
    End Sub
    Private Sub dgvPrjDwgs_CellMouseLeave(sender As Object, e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgvPrjDwgs.CellMouseLeave
        dgvPrjDwgs.RowsDefaultCellStyle.SelectionBackColor = Color.DimGray
    End Sub