Export DataGridView data to excel

In my application I'm exporting DataGridView data to excel sheet now I want to pass the combobox and textbox selected values to excel sheet and I have to give title to my excel sheet as Report for my windows application how can I do that?

Can anyone help me on this?

I have code for exporting datagridview data to excel:

private void btnexcel_Click(object sender, EventArgs e)    
{

  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 (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("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 c:\\csharp.net-informations.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();
    }    
}


}
}