private void Export_Trainess_Click(object sender, EventArgs e)
{
SaveFileDialog dialog = new SaveFileDialog();
dialog.Filter = "Файлы excel|*.xlsx";
if (dialog.ShowDialog() == DialogResult.OK)
{
List <DataTrainess> listTrainesses = DataTrainess.Select("");
string[,] values = new string[listTrainesses.Count + 1, 5];
values[0, 0] = "Класс";
values[0, 1] = "Фамилия";
values[0, 2] = "Имя";
values[0, 3] = "Отчество";
for (int i = 0; i < listTrainesses.Count; i++)
{
values[i + 1, 0] = listTrainesses[i].Class.ToString();
values[i + 1, 1] = listTrainesses[i].Family_name;
values[i + 1, 2] = listTrainesses[i].First_name;
values[i + 1, 3] = listTrainesses[i].Middle_name;
}
ExportData.ExportExcel(dialog.FileName, "Обучающиеся", values);
}
}