Grid View throwing error without getter setter methid

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C#

ASP.NET

Hi,
Let me explain the implementation first. Below is the base classes that I am using

public class DataClass
   {
       public string name;
       public int member;
   }

Following will give the data to the GridView

public class DataFields
   {
       public static List<DataClass> getData()
       {
           List<DataClass> dataList = new List<DataClass>();
           for (int i = 1; i < 10; i++)
           {
               DataClass data = new DataClass();
               data.name = "H" + i;
               data.member = i;
               dataList.Add(data);
           }
           return dataList;
       }
   }

Following is the aspx page class

protected void Page_Load(object sender, EventArgs e)
       {
           if (!IsPostBack)
           {
               GridView1.DataSource = DataFields.getData();
               GridView1.DataBind();
           }
       }

Though this is a simple implementation I got "gridview did not have any properties or attributes" error. But I solved this by implementing the DataClass in the following way

public class DataClass
  {
      public string name { get; set; }
      public int member { get; set; }
  }

I want to know why there is no error this time as I m using both the variables as public even before. I know it is not necessary to use the getter and setter method in all case. But I want to know why do we have to use under the above case.