Set multiple properties in a List<T> ForEach()?

All you need to do is introduce some brackets so that your anonymous method can support multiple lines:

list.ForEach(i => { i.a = "hello!"; i.b = 99; });

Anonymous method is your friend

list.ForEach(item => 
              { 
                  item.a = "hello!"; 
                  item.b = 99; 
              });

MSDN:

list.ForEach(lamba=>lambda.a="hello!");

Becomes

list.ForEach(item=>{
     item.a = "hello!";
     item.b = 99;
});

Of course you can also assign them when you create the list like :

var list = new List<foo>(new []{new foo(){a="hello!",b=99}, new foo(){a="hello2",b=88}});

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