How to replace list item in best way

Question

if (listofelements.Contains(valueFieldValue.ToString()))
{
    listofelements[listofelements.IndexOf(valueFieldValue.ToString())] = value.ToString();
}

Answer 1

You can use lambda expression like this.

int index = listOfElements.FindIndex(item => item.Id == id);  
if (index != -1) 
{
    listOfElements[index] = newValue;
}