什么对象可以读取多个节点

I'm not sure if I'm asking the this question correctly so forgive me in advanced if I'm not. I am fairly new to c# and coding in general. I have some code that parses an xml document (which is a bill for a customer). I have encountered an issue that I am trying to fix. A customer recently moved to another address which caused him to get billed twice. The xml that was generated came back with more than one of the same exact node. So the bill only had partial usage information and not all the information it was suppose to have. The code only checks for one node. or I'm assuming in this case it take the first node and uses that information. What I'm trying to accomplish is to modify my code to check for multiple nodes that are the same. then be able to parse all the nodes.I'm not sure if I'm asking the this question co