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Demonstrates a complex case based on the Shopping Cart model

Demonstrates a complex case based on the Shopping Cart model.

Suppose this is a checkout page where you have placed an order. You enter the quantity, which is multiplied by the price.
In addition, you use a DropDownList to select between one of three shipping rates.
There are 3 CalculationControllers here. The first calculates the product price x quantity. It updates row 1.
The second row uses a CalculationController to select between several possible prices and display its value.
The third row uses a CalculationController to add the value of the first and second rows.

Controls

Product name

Price

Quantity

Total

Computer Desk #5312-30

$200.00

Shipping

$12.80

Total Price

$212.80

Source Code (C#)

<table width="500">
   <tr class='TableTitles'>
      <td width="200">
         Product name
      </td>
      <td width="100">
         Price
      </td>
      <td width="100">
         Quantity
      </td>
      <td width="100">
         Total
      </td>
   </tr>
   <tr class="TableRows">
      <td>
         Computer Desk #5312-30
      </td>
      <td align="right">
         $200.00
      </td>
      <td>
         <des:IntegerTextBox ID="ProductQty1" runat="server" Width="30px" ShowSpinner="True"
            MinValue="1" MaxValue="99" AllowNegatives="False">1</des:IntegerTextBox>
      </td>
      <td align="right">
         <des:CalculationController ID="ProductCalc1" runat="server" ShowValueControlID="ProductTotal1"
            LabelFormatCurrencySymbol="True" LabelFormatThousandsSep="True" DecimalPlaces="Currency"
            AutoShowValue="Always">
            <Expression>
               <des:ConstantCalcItem Constant="200"></des:ConstantCalcItem>
               <des:NumericTextBoxCalcItem TextBoxControlID="ProductQty1" Operator="Multiply"></des:NumericTextBoxCalcItem>
            </Expression>
         </des:CalculationController>
         <asp:Label ID="ProductTotal1" runat="server"></asp:Label>
      </td>
   </tr>
   <tr class="TableRows">
      <td>
         Shipping
         <asp:DropDownList ID="ShippingDDL" runat="server">
            <asp:ListItem Value="Overnight">Overnight</asp:ListItem>
            <asp:ListItem Value="3 - 5 days">3 - 5 days</asp:ListItem>
            <asp:ListItem Value="Standard Ground">Standard Ground</asp:ListItem>
         </asp:DropDownList>
      </td>
      <td>
          
      </td>
      <td>
          
      </td>
      <td align="right">
         <des:CalculationController ID="ShippingCalc" runat="server" ShowValueControlID="ShippingTotal"
            LabelFormatCurrencySymbol="True" LabelFormatThousandsSep="True" DecimalPlaces="Currency"
            AutoShowValue="Always">
            <Expression>
               <des:ConditionCalcItem>
                  <ExpressionWhenTrue>
                     <des:ConstantCalcItem Constant="12.8"></des:ConstantCalcItem>
                  </ExpressionWhenTrue>
                  <ConditionContainer>
                     <des:SelectedIndexCondition ControlIDToEvaluate="ShippingDDL" >
                     </des:SelectedIndexCondition>
                  </ConditionContainer>
                  <ExpressionWhenFalse>
                     <des:ConditionCalcItem>
                        <ConditionContainer>
                           <des:SelectedIndexCondition ControlIDToEvaluate="ShippingDDL" 
                              Index="1"></des:SelectedIndexCondition>
                        </ConditionContainer>
                        <ExpressionWhenTrue>
                           <des:ConstantCalcItem Constant="8.75"></des:ConstantCalcItem>
                        </ExpressionWhenTrue>
                        <ExpressionWhenFalse>
                           <des:ConstantCalcItem Constant="4.25"></des:ConstantCalcItem>
                        </ExpressionWhenFalse>
                     </des:ConditionCalcItem>
                  </ExpressionWhenFalse>
               </des:ConditionCalcItem>
            </Expression>
         </des:CalculationController>
         <asp:Label ID="ShippingTotal" runat="server"></asp:Label>
      </td>
   </tr>
   <tr>
      <td>
         <b>Total Price</b>
      </td>
      <td>
          
      </td>
      <td>
          
      </td>
      <td align="right">
         <des:CalculationController ID="TotalCalc" runat="server" ShowValueControlID="PurchaseTotal"
            LabelFormatCurrencySymbol="True" LabelFormatThousandsSep="True" DecimalPlaces="Currency"
            AutoShowValue="Always">
            <Expression>
               <des:CalcControllerCalcItem ControlID="ProductCalc1"></des:CalcControllerCalcItem>
               <des:CalcControllerCalcItem ControlID="ShippingCalc"></des:CalcControllerCalcItem>
            </Expression>
         </des:CalculationController>
         <asp:Label ID="PurchaseTotal" runat="server"></asp:Label>
      </td>
   </tr>
</table>

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