Sum a value in Entity Collection in C#

Can someone help me figure out how to sum the quantity value here in the EntityCollection in C#?

Thanks in advance.


  string fetchXmlResult =
                             @"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false' >
  <entity name='salesorder'> 
                                                 <attribute name='productid'/>
                                                <attribute name='ordernumber'/> 
                                                <attribute name='quantity'/>  
  </entity>
</fetch>";

XmlElement element1= xml.CreateElement(string.Empty, "Order", xml.DocumentElement.NamespaceURI);
           

       EntityCollection xmlResult = _crmservice.RetrieveMultiple(new FetchExpression(fetchXmlResult())); 
 foreach (Entity e in xmlResult.Entities)
                {


                    XmlElement ordernumber= xml.CreateElement("OrderNumber", xml.DocumentElement.NamespaceURI);
                    ordernumber.InnerText =  e.Attributes["ordernumber"]).ToString();
                    element1.AppendChild(ordernumber);

                    XmlElement productid= xml.CreateElement("ProductId", xml.DocumentElement.NamespaceURI);
                    productid.InnerText =  e.Attributes["productid"]).ToString();
                    element1.AppendChild(productid);
}

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teknovationAsked:
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Fernando SotoConnect With a Mentor RetiredCommented:
Hi teknovation;

Declare a int variable outside the foreach loop and increment it by the quantity in the foreach, running total. When the loop is completed you will have the Total.

Have you given any thought of using Linq To XML to work with XML documents, it would make it a little simpler to work with.
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