postgresql - Not able to get value from drop down list, c# -


In the page load I am loading a drop down list with names from the PostGrey SQL Database using SQL. Later in the code, I want to save the selected value in the drop down list in a string variable. This page will not be loaded (works fine): 

  Protected Zero Page_Load (Object Sender, EventArgues E) {NPGSCock Connection Connection = New NPGSQL Connection (" Server = 127.0.0.1; port = 5432; database = ses; user id = postgrej; password = postgres;); conn.Open (); NpgsqlCommand command = new NpgsqlCommand ("name tbl_syv by name select", conn); NpgsqlDataReader dr = command.ExecuteReader (); While (Dr. Reid ()) {ddPersons.Items.Add (string) dr ["name"] + "" + ""); }}   
 Here Button1_Click I want to save the selected value to string variable  syv .  
  Protected Zero Button 1_Click (Object Sender, EventArgs e) {string syv = ddPersons.SelectedItem.Text; String name = txtName.Text; Int studentid = 0; NPGSQL Connection conn = New NPGSQL Connection ("Server = 127.0.0.1; Port = 5432; Database = SSYS; User ID = Postgrej; Password = Postgresres;"); conn.Open (); String sql = "SELECT id fROM tbl_student WHERE name = '" + name + "'"; Npgsql Commands Command = New NPGSQL Commands (Esquilla, Conn.); NpgsqlDataReader dr = command.ExecuteReader (); While (Dr. Reid ()) {studentid = (int) dr ["id"]; }} I have tried  
  string syv = ddPersons.SelectedItem.Text; String syv = ddPersons. Selected Item.Value; String syv = ddPersons.Text; String syv = ddPersons.SelectedValue;  
 
 It may be that the viewstoast is saving the status of your page. Why do not you include the following line in your page_load method:  
  if (! IsPostBack) {NpgsqlConnection conn = new NpgsqlConnection ("server = 127.0.0.1; ports = 5432; database = SYS; User id = postgrej; password = postgres; "); conn.Open (); NpgsqlCommand command = new NpgsqlCommand ("name tbl_syv by name select", conn); NpgsqlDataReader dr = command.ExecuteReader (); While (Dr. Reid ()) {ddPersons.Items.Add (string) dr ["name"] + "" + ""); }}   
 When clicking on a button on the page and prevents the viewsto from interfering in your control state, Page_load can be prevented from populating duplicate items.

Comments

Post a Comment

Popular posts from this blog

c# - ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type already has the same primary key value -

In brief, the wrapper module is inserted during posting and the status of an entry is changed to 'modified' . Before changing the state, the state is set to 'separate', but calling attachments () causes the same error to be thrown away. I am using EF 6. Model / wrapper class public class avi model {public A is a {get; Set; } Public listing & lt; B & gt; B {received; Set; } Public cc {receipt; Set; }} Administrator edit public functioning (int? id) {if (id == null) {new HttpStatusCodeResult (HttpStatusCode.BadRequest); } If (! Conveyor Access (id.Value)) new HTTPTitus code result (HTTP status code. Forbidden); Var aViewModel = new AViewModel (); aViewModel.A = db.As.Find (id); If (aViewModel.Receipt == zero) {return HttpNotFound (); } aViewModel.b = db.Bs.Where (x => x.aid == id.Value) .Oolist (); AViewModel.Vendor = db.Cs.Where (x => x.cid == aViewModel.a.cID) .FirstOrDefault (); See Return (aViewModel); } [HTPFost] [Valid AntitiferousTeacon...
Read more

jasper reports - How to center align barcode using jasperreports and barcode4j -

I use iReport 5.5.0 . How to align a barcode component to the center The relevant piece of my jrxml is below & Lt; JR: Code 128 xmlns: JR = "http://jasperreports.sourceforge.net/jasperreports/components" xsi: schemaLocation = "http://jasperreports.sourceforge.net/jasperreports/components http: //jasperreports.sourceforge Purge / xsd / components.xsd "textPosition =" bottom "& gt; & Lt; Jr: codeExpression & gt; & Lt; [CDATA [$ F {number}]] & gt; & Lt; / Jr: codeExpression & gt; & Lt; / Jr: Code 128 & gt; & Lt; / componentElement & gt; "Text" itemprop = "text"> Create a style after this, it is called "barcode", like: & lt; Style name = "barcode" fontName = "Helvetica" fONTSIZE = "10" hAlign = "center" valign = "center" /> and set the property of your barcode element to "barcode".
Read more

django - CommandError: You must set settings.ALLOWED_HOSTS if DEBUG is False -

I use Django 1.6.5 with settings in my program txsite: DEBUG = true I set the lie to debug, but when I get the runner , I get the following error: CommandError: You have to set the settings. OLOWOWHESTS If DEBUG is False I ALLOWED_HOSTS = ['127.0.0.1', 'localhost'] but I get the same error. Does anyone know this address? Try ALLOWED_HOSTS = ['*'] Less secure If you are not on a firewall or public LAN, but what I use and it works. Edit: Interestingly enough, I have to add some of my 1.8 projects, even if DEBUG = True . Why so very uncertain
Read more