protected void Button1_Click(object sender, EventArgs e) { if (Page.IsValid) { DataTable table = new DataTable(); table = AddUserBll.GetTable(); UserInfo user = new UserInfo(); user.userName = txtName.Text.Trim(); foreach (DataRow item in table.Rows) { if (item["userName"].ToString() == user.userName) { Response.Write("<script>alert('已存在此用户')</script>"); return; } } user.userPassword = txtPwd.Text.Trim(); if (AddUserBll.AddUserOK(user)) { Response.Write("<script>alert('注册成功')</script>"); } } }