Export to Excel in Windows applications

  BindingSource objBinding = new BindingSource();
        private void Form2_Load(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection("server=USER9-PC;database=Tasks;user id=sa;password=secure2011");
            SqlDataAdapter da = new SqlDataAdapter("select * from Location", con);
            DataTable dt = new DataTable();
            da.Fill(dt);
            objBinding.DataSource = dt;
            dataGridView1.DataSource = objBinding;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Microsoft.Office.Interop.Excel.ApplicationClass ExcelApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
            ExcelApp.Application.Workbooks.Add(Type.Missing);

            // Change properties of the Workbook
            ExcelApp.Columns.ColumnWidth = 20;

            // Storing header part in Excel
            for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
            {
                ExcelApp.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
            }

            // Storing Each row and column value to excel sheet
            for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
            {
                for (int j = 0; j < dataGridView1.Columns.Count; j++)
                {
                    ExcelApp.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value.ToString();
                }
            }
            //ExcelApp.ActiveWorkbook.Save();
           // ExcelApp.ActiveWorkbook.SaveCopyAs("C:\\Users\\user 9\\Downloads\\Export DataGridView to Excel\\Export DataGridView to Excel\\test.xls");
            ExcelApp.ActiveWorkbook.Saved = true;
            ExcelApp.ActiveWorkbook.SaveAs("C:\\Users\\user 9\\Desktop\\test.xls",Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive , Type.Missing, Type.Missing, Type.Missing, Type.Missing,Type.Missing);
            ExcelApp.Quit();
        }

        private void button2_Click(object sender, EventArgs e)
        {
             Microsoft.Office.Interop.Excel.Application xlApp ;
            Microsoft.Office.Interop.Excel.Workbook xlWorkBook ;
            Microsoft.Office.Interop.Excel.Worksheet xlWorkSheet ;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
            xlWorkBook = xlApp.Workbooks.Add(misValue);
            xlWorkSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
            int i = 0;
            int j = 0;

            for (i = 0; i <= dataGridView1.RowCount  - 1; i++)
            {
                for (j = 0; j <= dataGridView1.ColumnCount  - 1; j++)
                {
                    DataGridViewCell cell = dataGridView1[j, i];
                    xlWorkSheet.Cells[i + 1, j + 1] = cell.Value;
                }
            }

            xlWorkBook.SaveAs("C:\\Users\\user 9\\Desktop\\test1.xls", Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Microsoft.Office.Interop.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 C:\\Users\\user 9\\Desktop\\test1.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();
            }
        }