C# public class declaration

Question

basically my problem is like this. In tutorinput.aspx.cs, i have public class tutorinput: Page{ public DataTable stud_tbl = new DataTable(); public void Page_Load(){ .... .... stud_tbl.Columns.Add ..... stud_tbl gets data from Arrays, not sql tbls } public void SubmitBtn_Click(Object sender, EventArgs e) { for(int i=0; i