MVC3 ASP Replace null value with empty space on the view - asp.net-mvc-3

Question

I have the following view which returns some text if the POnumber is null.
What I think I need to have instead of the if(Model.Invoice.PONumber == null) is a check mechanism ( maybe multiple if statements ) that will check the fields LineNumber, Description, UnitOfMeasure, QtyOrdered and if any of them is null it will replace it with N/A or empty space but it will still allow the user to see the rest of information available.
Do you have any sugestions? I am new to MVC and any help will be apreciated.
Thank you in advance for your time and help,Bobby
<div class="contentWrapper2">
<div class="content2">
<div class="clr lfl w100">
<h1>Invoice Detail</h1>
<div class="return-btn">
<a class="btn btnStyleC btn-back-invoice" href="#Url.Action("InvoiceHistory", "Account")">
Back to Invoice List</a>
</div>
</div>
#if (Model.ErpError.Length > 0)
{
<div class="clr lfl w100 error">
#Html.Raw(Model.ErpError)
</div>
}
else
{
if(Model.Invoice.PONumber == null)
{
<div class="lfl w100 clr messaging">
<p>No information available at the moment for current invoice.
Please call our sales department for further assistance.
</p>
</div>
}
else
{
<div class="clr lfl w100">
<div class="order-number-date">
<table>
<tr>
<th class="col-1">
<h3>Invoice #:</h3>
</th>
<td class="col-2">
<h3>#Model.Invoice.InvoiceNumber</h3>
</td>
</tr>
<tr>
<th class="col-1">
<h3>Invoice Date:</h3>
</th>
<td class="col-2">
<h3>#Model.Invoice.InvoiceDate.ToShortDateString()</h3>
</td>
</tr>
</table>
</div>
<div class="order-number-date">
<table>
<tr>
<th class="col-1">
<h3>Order #:</h3>
</th>
<td class="col-2">
<h3>#Model.Invoice.OrderNumber</h3>
</td>
</tr>
<tr>
<th class="col-1">
<h3>PO #:</h3>
</th>
<td class="col-2">
<h3>#Model.Invoice.PONumber</h3>
</td>
</tr>
<tr>
<th class="col-1">
<h3>Due Date:</h3>
</th>
<td class="col-2">
<h3>#Model.Invoice.DueDate.ToShortDateString()</h3>
</td>
</tr>
</table>
</div>
</div>
<div class="clr lfl w100">
<div class="bill-ship">
<table>
<tr>
<th>
<h4>Billing Information</h4>
</th>
</tr>
<tr>
<td>#Model.Invoice.BTDisplayName
</td>
</tr>
<tr>
<td>
<#Html.Raw(Model.Invoice.BTAddress1)
</td>
</tr>
#if (!string.IsNullOrEmpty(Model.Invoice.BTAddress2))
{
<tr>
<td>#Html.Raw(Model.Invoice.BTAddress2)
</td>
</tr>
}
<tr>
<td>#Html.CityCommaStateZip(Model.Invoice.BTCity, Model.Invoice.BTState, Model.Invoice.BTZip)</td>
</tr>
<tr>
<td>#Model.Invoice.BTCountry
</td>
</tr>
<tr>
<td>#Model.Invoice.BTPhone1</td>
</tr>
<tr>
<td>#Model.Invoice.BTEmail
</td>
</tr>
</table>
</div>
</div>
if (Model.Invoice.InvoiceLines.Count > 0)
{
<div class="clr lfl w100 line-item-detail">
<table class="info-tbl">
<tr>
<th class="vid-item">Item #</th>
<th class="vid-desc">Description</th>
<th class="vid-um">
U/M
</th>
<th class="vid-qty">
Qty
</th>
<th class="vid-ship">
Ship Date
</th>
#if (Model.ShowPackslip)
{
<th class="vid-pack">Pack Slip</th>
}
<th class="vid-unit">Unit Price</th>
<th class="vid-ext">Ext Price</th>
</tr>
#foreach (var invoiceLine in Model.Invoice.InvoiceLines)
{
<tr>
<td class="vid-line">#invoiceLine.LineNumber</td>
<td class="vid-desc">#invoiceLine.Description</td>
<td class="vid-um">#invoiceLine.UnitOfMeasure</td>
<td class="vid-qty">#invoiceLine.QtyOrdered</td>
<td class="vid-ship">
#if (invoiceLine.ShipDate.ToShortDateString() == "1/1/0001")
{
}
else
{
#invoiceLine.ShipDate.ToShortDateString()
}
</td>
#if (Model.ShowPackslip)
{
<td class="vid-pack">
#invoiceLine.PackSlip
</td>
}
<td class="vid-unit">#invoiceLine.UnitPrice.ToCurrency()
</td>
<td class="vid-ext">#invoiceLine.ExtendedPrice.ToCurrency()
</td>
</tr>
}
</table>
</div>
}
<div class="clr lfl w100">
<table class="tbl-total">
<tr class="subtotal">
<th class="col-1">Subtotal</th>
<td class="col-2">#Model.Invoice.OrderSubTotal.ToCurrency()
</td>
</tr>
#if (Model.Invoice.DollarOffOrder > 0)
{
<tr>
<th class="col-1">Order Discount</th>
<td class="col-2">#Model.Invoice.DollarOffOrder.ToCurrency()</td>
</tr>
}
#if (Model.Invoice.ShippingAndHandling > 0)
{
<tr>
<th class="col-1">Shipping</th>
<td class="col-2">#Model.Invoice.ShippingAndHandling.ToCurrency()
</td>
</tr>
}
#if (Model.Invoice.MiscCharges > 0)
{
<tr>
<th class="col-1">Misc. Charges</th>
<td class="col-2">#Model.Invoice.MiscCharges.ToCurrency()</td>
</tr>
}
<tr>
<th class="col-1">Sales Tax</th>
<td class="col-2">#Model.Invoice.TotalTax.ToCurrency()</td>
</tr>
<tr>
<th class="col-1">Invoice Total</th>
<td class="col-2">#Model.Invoice.InvoiceTotal.ToCurrency()</td>
</tr>
</table>
</div>
<div class="clr lfl w100">
<a class="btn btnStyleB btn-print" href="javascript:window.print();">Print</a>
</div>
}
}
</div>
</div>

Answer 1

You could create a template called for example "nullcheck.cshtml" like:
#if (ViewBag.ValueToCheck == null) {
<div class="lfl w100 clr messaging">
<p>
No information available at the moment for #(ViewBag.Field).
Please call our sales department for further assistance.
</p>
</div>
}
else {
#Html.Partial(ViewBag.TargetTemplate, Model)
}
Then you call it from your main view:
#{
ViewBag.TargetTemplate = "okModel";
ViewBag.Field = "P.O.Number";
ViewBag.ValueToCheck = Model.Invoice.PONumber;
Html.RenderPartial("nullCheck", Model, ViewBag);
}
okModel.cshtml should be the part of your template you will display when the value is not null...
I haven't tested this myself but it should give you some ideas... contact me if things go wrong XD
Cheers!

Answer 2

This seems like something you should take care of in your controller.
public ActionResult YourControllerAction()
{
var myViewModel = SomeService.GetMyViewModel();
if (myViewModel.Invoice.PONumber == null)
{
myViewModel.Invoice.PONumber = "N/A";
}
//etc
}
This leaves your view clearer (my personal preference)
However in the view you could simply use the null coalescing operator like so:
#Model.Invoice.PONumber ?? "NA"