How to set viewcell or label height. a long post will come. Because I can not give a length, does no

        <ViewCell>
                        <ViewCell.View>
                            <Grid Padding="5">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="Auto"/>
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                </Grid.RowDefinitions>
                                <Label Text="Description" VerticalOptions="Start"/>
                                <Label x:Name="lblRulesDesc" Grid.Column="1" LineBreakMode="WordWrap"/>
                            </Grid>
                        </ViewCell.View>
                    </ViewCell>