what are main differences between SelectNodes and GetElementsByTagName.
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SelectNodes is a .NET/MSXML-specific method that gets a list of matching nodes for an XPath expression. XPaths can select elements by tag name but can also do lots of other, more complicated selection rules.
getElementByTagName is a DOM Level 1 Core standard method available in many languages (but spelled with a capital
Gin .NET). It selects elements only by tag name; you can’t ask it to select elements with a certain attribute, or elements with tag nameainside other elements with tag namebor anything clever like that. It’s older, simpler, and in some environments faster.