Deserialize multiple XML elements have same name

i have an XML form look like this:

<case_id_list>
   <case_id>AAA-P-E-00002</case_id>
   <case_id>AAA-P-E-00003</case_id>
   <case_id>AAA-P-E-00004</case_id>
   <case_id>AAA-P-E-00005</case_id>
   ..........
   <case_id>AAA-P-E-00099</case_id>

What should structure class, variables should i use to deserialize it. I want to read and update value of each element. I have try this, but it doesn't work:

public class case_id_list
{
  public List<string> case_id {get; set;}
  // or public string[] case_id { get; set; }
}