can not export datagridview coloumn headers to excel

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C#

C#4.0

i m deveoping window application in c#.

my datagridview data is easily exported to excel.
but i m getting error when i also want to export datagridview's headers to excel.
error is : Exception from HRESULT: 0x800A03EC

and i m using code below

public void ExcelConversion()
        {
            Excel.Application xlApp;
            Excel.Workbook xlWorkBook;
            Excel.Worksheet xlWorkSheet;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new Excel.Application();
            //xlApp = new Excel.Application();
            xlWorkBook = xlApp.Workbooks.Add(misValue);
            xlWorkSheet = (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[]
                    if (i == 0)
                    {
                        DataGridViewCell cell1 = dataGridView1[j, i];
                        //for (int m = 0; m < dataGridView1.Columns.Count; m++)
                        //{

                            xlWorkSheet.Cells[1, j] = dataGridView1.Columns[j].HeaderText.ToString();
                        //}
                        //MessageBox.Show(dataGridView1.Columns[0].HeaderText);
                    }
                    else
                    {
                        xlWorkSheet.Cells[i + 1, j + 1] = cell.Value;
                    }
                }
            }

            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);

can anyone help me please?
THANKS IN ADVANCE