Question

Very new to .Net. Everything was working fine until I added <Tracking> to my XML file:

<Product>
    <id>product1</id>
    <Name>Product 1</Name>
    <Packart>detailimg</Packart>
    <TitleFile>detailtitleoriginal</TitleFile>
    <Description>Description</Description>
    <Ingredients>Ingredients</Ingredients>
    <FeedingInstructions>Instructions</FeedingInstructions>
    <Analysis>Analysis</Analysis>
    <Footer>Footer</Footer>
    **<Tracking>Test</Tracking>**
</Product>

My XSD file is such:

<?xml version="1.0" encoding="utf-8" ?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified"
xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="Products">
        <xs:complexType>
            <xs:sequence>
                <xs:element maxOccurs="unbounded" name="Product">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="id" type="xs:string" />
                            <xs:element name="Name" type="xs:string" />
                            <xs:element name="Packart" type="xs:string" />
                            <xs:element name="TitleFile" type="xs:string" />
                            <xs:element name="Description" type="xs:string" />
                            <xs:element name="Ingredients" type="xs:string" />
                            <xs:element name="FeedingInstructions" type="xs:string" />
                            <xs:element name="Analysis" type="xs:string" />
                            <xs:element name="Footer" type="xs:string" />
                            <xs:element name="Tracking" type="xs:string" /></xs:sequence>
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

Then in my aspx page I added:

<%=row[ "Tracking"]%>

When I view the page in a browser I get the error:

Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Data.ConstraintException: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.

Source Error: 


Line 19:             ds = new System.Data.DataSet();
Line 20:             ds.ReadXmlSchema(MapPath("Content/xml/Products.xsd"));
Line 21:             ds.ReadXml(MapPath("Content/xml/Products.xml"));
Line 22:             Cache.Insert("Products", ds, new System.Web.Caching.CacheDependency(MapPath("Content/xml/Products.xml")),
Line 23:                          DateTime.Now.AddHours(12), System.Web.Caching.Cache.NoSlidingExpiration);

Source File: d:\ProductDetails.aspx.cs    Line: 21 

Answer 1

One way to overcome this issue quickly is to disable EnforceConstraints on the dataset:

ds.EnforceConstraints = false;
//now you can load the data 

UPDATE: This may have unwanted repercussions, obviously. You should decide whether this is the case or not in your scenario.