Passing command arguments to a checkbox

I needed to add batch printing functionality to an application.

I added a Gridview to a page and handled the GridView OnRowDataBound event.
I added a TemplateField ItemTemplate to the Columns collection with a checkbox (to include in batch printing job).
I added a batch print button and handled the OnClick event:

protected void GridView1_OnRowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            if (DataBinder.Eval(e.Row.DataItem, "ApplicantId") != System.DBNull.Value)
            {
                int applicantId = System.Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "ApplicantId"));
                int applicationId = System.Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "ApplicationId"));
                CheckBox cbPrint = e.Row.FindControlRecursive<CheckBox>("cbPrint");
                cbPrint.Attributes["CommandArgument"] = string.Format("{0},{1}", applicationId, applicantId);
            }
        }
    }

In the batch print OnClick event, I added:

string[] args = checkbox.Attributes["CommandArgument"].Split(',');
                    if (args.Length == 2)
                    {
                        int applicationId, applicantId;
                        int.TryParse(args[0], out applicationId);
                        int.TryParse(args[1], out applicantId);
RAM.OLSA.Services.ApplicationService applicationService = new RAM.OLSA.Services.ApplicationService();
RAM.OLSA.Entities.Application application = applicationService.GetByApplicationIdApplicantId(applicationId, applicantId);