//选课
private void btn_select_Click(object sender, EventArgs e)
{
DataGridViewSelectedRowCollection selectedRow = this.dataGridView1.SelectedRows;
if (selectedRow != null)
{
foreach (DataGridViewRow row in selectedRow)
{
CourseBusiness courseBusiness = new CourseBusiness();
int isSelected = courseBusiness.selectCourse(this.studentModel.Sid, int.Parse(row.Cells["cid"].Value.ToString()));
if (isSelected == 2)
{
MessageBox.Show("您还没有修此课的先修课程，不能选此课。");
}
else if (isSelected == 3)
{
MessageBox.Show("时间冲突，请重新选择！");
}
else if (isSelected == 1)
{
MessageBox.Show("选课成功!");
}
else if (isSelected == 0)
{
MessageBox.Show("您已选中此课");
}
else if (isSelected == -1)
{
MessageBox.Show("选课失败，请再试一次");
}
}
}
}
