export datagridview into excel

Question

 i m using  this code for exporting data from datagridview to excel . but one problem is here, the date value is  not inserted into excel ,it display in excel like ######. how resolve it?plz help?

 private void button2_Click(object sender, EventArgs e)

        {

 

            // export data into excel shhet

 

 

            Excel.Application xlApp;

            Excel.Workbook xlWorkBook;

            Excel.Worksheet xlWorkSheet;

            object misValue = System.Reflection.Missing.Value;

 

            xlApp = new Excel.ApplicationClass();

            xlWorkBook = xlApp.Workbooks.Add(misValue);

            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

            // int i = 0;

            //int j = 0;

 

 

            for (int i = 1; i < displaygrid.Columns.Count + 1; i++)

            {

                xlWorkSheet.Cells[1, i] = displaygrid.Columns[i - 1].HeaderText;

            }

 

 

 

            // storing Each row and column value to excel sheet

            for (int i = 0; i < displaygrid.Rows.Count - 1; i++)

            {

                for (int j = 0; j < displaygrid.Columns.Count; j++)

                {

                    xlWorkSheet.Cells[i + 2, j + 1] = displaygrid.Rows[i].Cells[j].Value.ToString();

                }

            }

 

          

            xlWorkBook.SaveAs("students.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:\\students.xls");

        }