Kale you can try this simple approach for converting back and forth between DataGridView control and Excel:
ExcelFile ef = ExcelFile.Load(openFileDialog.FileName);

// From ExcelFile to DataGridView.
DataGridViewConverter.ExportToDataGridView(ef.Worksheets.ActiveWorksheet, this.dataGridView1, new ExportToDataGridViewOptions() { ColumnHeaders = true });


ExcelFile ef = new ExcelFile();
ExcelWorksheet ws = ef.Worksheets.Add("DataGridView Sheet");

// From DataGridView to ExcelFile.
DataGridViewConverter.ImportFromDataGridView(ws, this.dataGridView1, new ImportFromDataGridViewOptions() { ColumnHeaders = true });

ef.Save(saveFileDialog.FileName);
The code uses this Excel component for .NET framework. Now regarding your second task, I'm not sure what you need. As you mentioned you have student photos in an excel sheet and with the above code you will get those photos in DataGridView cells.
Again I'm not sure but I presume you want to change these photos, then you can just change them when user clicks on them, like this:
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
   var cell = ((DataGridView)sender).Rows[e.RowIndex].Cells[e.ColumnIndex];

   if (cell.FormattedValueType == typeof(Image))
       cell.Value = Image.FromFile(@"C:\New Photo.png");
}

ref following url:


http://www.codeproject.com/Articles/28269/Exporting-a-DataGridView-to-an-Excel-PDF-image-fil