请教个问题,
string name = TextBox1.Text;
string passwd = TextBox3.Text;
string sql = "Select Stu_Name from register where Stu_No = '"+Stu_No+"'";
SqlCommand reg = new SqlCommand(sql,sqlconnection1);
SqlDataReader ds;
ds = reg.ExecuteReader();
if(!ds.Read())
{
Response.Write("<script language=javascript>alert('该学号已经注册');</script>");
}
用这个东西
怎么每次我随便输入一个学号他都显示提示信息,学号已经注册啊 ?