سلام دوستان من موقع کامپایل برنامه با این ارور مواجه میشم

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;

namespace Information
{
    class Information : Iinformation
    {
        private string connection = "Data Source =.; Initial Catalog = Information_DB; Integrated Security = true;";
        public DataTable data()
        {
            string Query = "select * from Information_DB";
            SqlConnection connect = new SqlConnection(connection);
            SqlDataAdapter adapter = new SqlDataAdapter(Query , connect);
            DataTable dataTable = new DataTable();
             adapter.Fill(dataTable);
            return dataTable;
        }
    }
}