Accessing XML data from C#

I'm struggling with accessing to the data stored in the XML file from C#. I read a lot of posts - the closest one was here - but still can't get it working.

The xml node looks like below:

<Prop Name='StartTime' Type='Number' Flags='0x0'>
<Value>171.8032865</Value>
</Prop>

I need to know what is the value of the property named 'StartTime'