/// <summary>
/// Fills a range of Checkbox-Values to the temporary datastorage.
/// </summary>
/// <param name="rows">The GridViewRows containing the values</param>
/// <param name="idLabelName">the Control-ID of the label containing the id (must be an int!)</param>
/// <param name="checkBoxName">the Control-ID of the checkbox containing the boolean value</param>
public void AddRange(GridViewRowCollection rows, string idLabelName, string checkBoxName)
{
for (int i = 0; i < rows.Count; i++)
{
bool value = ((CheckBox)rows[i].FindControl(checkBoxName)).Checked;
int id = -1;
if (int.TryParse(((Label)rows[i].FindControl(idLabelName)).Text, out id))
Add(id, value);
}
}