These additional validity constraints may involve cross-referencing supplied data with a known look-up table or directory information service such as LDAP.For example, an experienced user may enter a well-formed string that matches the specification for a valid e-mail address, as defined in RFC 5322 but that well-formed string might not actually correspond to a resolvable domain connected to an active e-mail account.Therefore, data validation should start with business process definition and set of business rules within this process.Rules can be collected through the requirements capture exercise.Reinforcing and validating the values of goods are the social values of men.
In computer science, data validation is the process of ensuring that data have undergone data cleansing to ensure they have data quality, that is, that they are both correct and useful.
NET Framework 2.0, we recommend that you use the Xml Reader Settings class and the Xml Reader Sets the Xml Resolver used for resolving external document type definition (DTD) and schema location references.
Checks whether the current node is a content (non-white space text, CDATA, Element, End Element, Entity Reference, or End Entity) node.
After an exception is thrown the state of the reader is not predictable. You can create a validating Xml Reader instance by using the Xml Reader Settings class and the Create method.
For example, the reported node type may be different than the actual node type of the current node. For more information, see the Remarks section of the Xml Reader reference page.