将数据从sql数据库导出到excel直接

将数据从sql数据库直接导出到excel，此代码无效，我没有在特定位置获取文件。请帮我找到代码。

和我的连接字符串是Data Source = aswin-pc\sqlexpress; Initial Catalog = pro; Integrated Security = True

Exporting the data from sql database to excel directly,this code is not working and i am not getting file in particular location.kindly help me out in finding the code.
and my connection string is Data Source=aswin-pc\sqlexpress;Initial Catalog=pro;Integrated Security=True

using Excel=Microsoft.Office.Interop.Excel;
using System.Runtime.InteropServices;
namespace WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        SqlConnection con = new SqlConnection(ConfigurationSettings.AppSettings["SqlCon"].ToString());

        public Form1()
        {
            InitializeComponent();
        }
  
        private void button2_Click(object sender, EventArgs e)
        {
            string data = null;

            Excel.Application xlApp;
            Excel.Workbook xlWorkBook;
            Excel.Worksheet xlWorkSheet;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new Excel.Application();
            xlWorkBook = xlApp.Workbooks.Add(misValue);
            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
            con = new SqlConnection("Data Source=aswin-pc\\sqlexpress;Initial Catalog=pro;Integrated Security=True");
            con.Open();
            SqlCommand cmd = new SqlCommand("SELECT * FROM Details", con);
            SqlDataAdapter dscmd = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            dscmd.Fill(ds);
            for (int i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
            {
                for (int j = 0; j <= ds.Tables[0].Columns.Count - 1; j++)
                {
                    data = ds.Tables[0].Rows[i].ItemArray[j].ToString();
                    xlWorkSheet.Cells[i + 1, j + 1] = data;
                }
                xlWorkBook.SaveAs("csharp.net-informations.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
                xlWorkBook.Close(true, misValue, misValue);
                xlApp.Quit();
                releaseObject(xlWorkSheet);
                releaseObject(xlWorkBook);
                releaseObject(xlApp);

                MessageBox.Show("Excel file created , you can find the file @ D:\\kk.xls");
            }
        }

        private void releaseObject(object obj)
        {
            try
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
                obj = null;
            }
            catch (Exception ex)
            {
                obj = null;
                MessageBox.Show("Exception Occured while releasing object " + ex.ToString());
            }
            finally
            {
                GC.Collect();
            }
        }
    }
}