How to convert the child elements values in list

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C#

XML

<?xml version="1.0" encoding="ISO-8859-1"?>
<Diag_Configuaration>
<Standard_Error>
<stopmode>
<value1>FreeWheel</value1>
<value2>Manual/AFR</value2>
</stopmode>
<priority>
<value1>Normal</value1>
<value2>High</value2>
</priority>
<ResetMethod>
<value1>Manual</value1>
<value2>Manual/AFR</value2>
</ResetMethod>
</Standard_Error>
</Diag_Configuaration>

i have tried using Xpath to read the values but it has only particular child node values, sometimes innertext has combined values like " NormalHigh" how can be the xml and its child node's values will convert to List. in the above XML i need to create three list of 1. stopmode, 2.priority, 3. Resetmethod. the innertext should be values in each respective list.

What I have tried:

XmlDocument doc = new XmlDocument();
                doc.Load("C:\\TestDataBaseManager\\Diag_Congiuration.xml");

                XmlNodeList stopmode = doc.SelectNodes("/Diag_Configuaration/Standard_Error/stopmode");

                foreach(XmlNode node in stopmode)
                {                    
                    StopMode.Items.Add(node.InnerText);
                }

                XmlNodeList priority = doc.SelectNodes("/Diag_Configuaration/Standard_Error/priority");

                foreach (XmlNode node in priority)
                {
                    Priority.Items.Add(node.InnerText);
                }

                XmlNodeList resetmethod = doc.SelectNodes("/Diag_Configuaration/Standard_Error/ResetMethod");

                foreach (XmlNode node in resetmethod)
                {
                    ResetMethod.Items.Add(node.InnerText);
                }