Problem to export data to excel in sharepoint list

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.Office.Interop.Excel;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Client;

namespace test.VisualWebPart1
{
    public partial class VisualWebPart1UserControl : UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            error.Text = "";
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            try
            {
                System.Data.OleDb.OleDbConnection MyConnection;
                System.Data.OleDb.OleDbCommand myCommand = new System.Data.OleDb.OleDbCommand();
                string sql = null;
                MyConnection = new System.Data.OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source='//eccoe-sps2010:9001/test1/Forms/AllItems.aspx';Extended Properties=Excel 12.0 Xml;");
                string date = DateTime.Today.ToShortDateString();
                MyConnection.Open();
                myCommand.Connection = MyConnection;
                sql = "Insert into [S1$] ([DATE]) values('" + date + "')";
                myCommand.CommandText = sql;
                myCommand.ExecuteNonQuery();
                MyConnection.Close();
            }
            catch (Exception ex)
            {
                error.Text = ex.Message;
            }
        }
    }
}