Check out example codes for "c# select first value from list". It will help you in understanding the concepts better.

Code Example 1

//You can also use FirstOrDefault() just in case lstComp does not contain any items.

//To get the Component Value:
var firstElement = lstComp.First().ComponentValue("Dep");

//This would assume there is an element in lstComp. An alternative and safer way would be...
var firstOrDefault = lstComp.FirstOrDefault();
if (firstOrDefault != null) 
    var firstComponentValue = firstOrDefault.ComponentValue("Dep");

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