protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection conn = BaseClass.DBCon();
conn.Open();
SqlCommand cmd = new SqlCommand("select count(*) from tb_homework where StuNo='" + Session["ID"] + "' and ChapTitle='" + DropDownList1.SelectedValue.ToString() + "'", conn);
int i = Convert.ToInt32(cmd.ExecuteScalar());
if (i > 0)
{
Response.Write("<script language=javascript>alert('您已提交作业！')</script>");
}
else
{
string Time = System.DateTime.Now.ToString();
string No = Session["ID"].ToString();
string Content = TextBox1.Text;
string Chap = DropDownList1.SelectedValue.ToString();
Homework homework = new Homework();
homework.Add(Time, No, Content, Chap);
TextBox1.Text = "";
}
}