Given:
List names = new List(); //list full of names
public void RemoveName(string name) {
List n = names.Where(x => x
names.RemoveAll(x => x.UserName == name);
Note here that all the lambda syntax does is provide a Predicate
; lambda syntax is entirely unrelated to what it ends up doing with the lambda.
Or for a single match (see comments):
var found = names.Find(x => x.UserName == name);
if(found != null) names.Remove(found);
or:
var index = names.FindIndex(x => x.UserName == name);
if(index >= 0) names.RemoveAt(index);