Total Summary

<dx:ASPxCardView ID="ASPxCardView1"  runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" KeyFieldName="ProductID">
    <Settings ShowSummaryPanel="True" />
    <Columns>
        ...
    </Columns>
    <TotalSummary>
        <dx:ASPxCardViewSummaryItem FieldName="ProductID" SummaryType="Count" DisplayFormat="Count of products = {0} " />
        <dx:ASPxCardViewSummaryItem FieldName="UnitPrice" SummaryType="Min" DisplayFormat="Minimum price = ${0} " />
        <dx:ASPxCardViewSummaryItem FieldName="UnitPrice" SummaryType="Max" DisplayFormat="Maximum price = ${0} " />
        <dx:ASPxCardViewSummaryItem FieldName="UnitsInStock" SummaryType="Sum" DisplayFormat="Units in stock = {0} " />
    </TotalSummary>
</dx:ASPxCardView>

ASPxCardViewSummaryItem totalSummary = new ASPxCardViewSummaryItem();
totalSummary.FieldName = "UnitPrice";
totalSummary.SummaryType = DevExpress.Data.SummaryItemType.Average;
ASPxCardView1.TotalSummary.Add(totalSummary);