When set to true, the XmlReader throws an XmlException when any DTD content is encountered. Do not enable DTD processing if you are concerned about Denial of Service issues or if you are dealing with untrusted sources. If you have DTD processing enabled, you can use the XmlSecureResolver to restrict the resources that the XmlReader can access. You can also design your application so that the XML processing is memory and time constrained. For example, configure time-out limits in your ASP.NET application. This property is obsolete.
Beyond knowing the techniques, a competent welder must also be familiar with the tools of the trade, and in our Pennsylvania and Ohio-area welding schoolâs program, you certainly will be. Once you finish our welding schoolâs courses and enter the job field, you can expect to regularly encounter tools like:
1 If you're interested in moving on to become a welder in your own right, your welder helper job is a useful source of contacts within the industry. 2  Let your employers or union local know you're interested in an apprenticeship, and check regularly for openings in a suitable program.tep 1. Take welding and metalworking courses in high school shop, if you have the opportunity. Good math skills are also helpful on the job site. You don't need to graduate from high school before working as a helper, but you'll need your diploma or a GED to move on to a welding apprenticeship.