[英]deleting from DB using a dropdownlist
您好,即時通訊使用dropdownlist從表中獲取ID,然后在運行頁面teh dropdownlist時使用刪除按鈕刪除該行,所有表中的ID都很好,但是當我刪除它時,即使我選擇了它,也總是刪除最后一個ID另一個
List<classe_cv_langues> li6 = new List<classe_cv_langues>();
SqlConnection con4 = new SqlConnection(@"Data Source=p5-pc\sqlexpress;Initial Catalog=recrutement_online_3;Integrated Security=True");
SqlCommand cmd4 = new SqlCommand();
cmd4.Connection = con4;
con4.Open();
cmd4.CommandText = "select id from cv_langues as cl inner join cv as c on cl.id_cv = c.id_cv where id_candidat= " + Session["Id_candidat"];
SqlDataReader dr4 = cmd4.ExecuteReader();
while (dr4.Read())
{
classe_cv_langues p6 = new classe_cv_langues();
p6.Id = int.Parse(dr4[0].ToString());
li6.Add(p6);
}
dr4.Close();
con4.Close();
DropDownList7.DataSource = li6;
DropDownList7.DataTextField = "id";
DropDownList7.DataValueField ="id";
DropDownList7.DataBind()
刪除按鈕:
SqlConnection con = new SqlConnection(@"Data Source=p5-pc\sqlexpress;Initial Catalog=recrutement_online_3;Integrated Security=True");
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
con.Open();
cmd.CommandText = "delete from cv_langues where id='"+DropDownList7.SelectedValue+"'";
cmd.ExecuteNonQuery();
con.Close();
Server.Transfer("gestion_cv.aspx");
假設您的綁定邏輯在page_load方法上。 嘗試測試Page.IsPostBack
if (!Page.IsPostBack)
{
List<classe_cv_langues> li6 = new List<classe_cv_langues>();
SqlConnection con4 = new SqlConnection(@"Data Source=p5-pc\sqlexpress;Initial Catalog=recrutement_online_3;Integrated Security=True");
SqlCommand cmd4 = new SqlCommand();
cmd4.Connection = con4;
con4.Open();
cmd4.CommandText = "select id from cv_langues as cl inner join cv as c on cl.id_cv = c.id_cv where id_candidat= " + Session["Id_candidat"];
SqlDataReader dr4 = cmd4.ExecuteReader();
while (dr4.Read())
{
classe_cv_langues p6 = new classe_cv_langues();
p6.Id = int.Parse(dr4[0].ToString());
li6.Add(p6);
}
dr4.Close();
con4.Close();
DropDownList7.DataSource = li6;
DropDownList7.DataTextField = "id";
DropDownList7.DataValueField ="id";
DropDownList7.DataBind()
}
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