asp.net - Control [...] of type [...] must be placed inside a form tag with runat=server - but already is -

-

asp.net says asp:button needs inside <form runat="server". inside form. why still wrong?

default.aspx:

<%@ page language="c#" autoeventwireup="true" codefile="default.aspx.cs" inherits="_default" %>  <!doctype html> <html>     <head>         <title>test case</title>     </head>     <body>         <asp:placeholder runat="server" id="ph"/>         <form runat="server">             <asp:button runat="server" text="foobar"/>         </form>     </body> </html>

default.aspx.cs:

using system; using system.web.ui.webcontrols;  public partial class _default : system.web.ui.page {     protected void page_load(object sender, eventargs e)     {         ph.controls.add(new button());     } }

error message:

control 'ctl02' of type 'button' must placed inside form tag runat=server.

stack trace:

[httpexception (0x80004005): control 'ctl02' of type 'button' must placed inside form tag runat=server.]

system.web.ui.page.verifyrenderinginserverform(control control) +9745742 system.web.ui.webcontrols.button.addattributestorender(htmltextwriter writer) +62 system.web.ui.webcontrols.webcontrol.renderbegintag(htmltextwriter writer) +20 system.web.ui.webcontrols.webcontrol.render(htmltextwriter writer) +20 system.web.ui.control.rendercontrolinternal(htmltextwriter writer, controladapter adapter) +66 system.web.ui.control.rendercontrol(htmltextwriter writer, controladapter adapter) +100 system.web.ui.control.rendercontrol(htmltextwriter writer) +25 system.web.ui.control.renderchildreninternal(htmltextwriter writer, icollection children) +128 system.web.ui.control.renderchildren(htmltextwriter writer) +13 system.web.ui.control.render(htmltextwriter writer) +12 system.web.ui.control.rendercontrolinternal(htmltextwriter writer, controladapter adapter) +66 system.web.ui.control.rendercontrol(htmltextwriter writer, controladapter adapter) +100 system.web.ui.control.rendercontrol(htmltextwriter writer) +25 system.web.ui.control.renderchildreninternal(htmltextwriter writer, icollection children) +128 system.web.ui.control.renderchildren(htmltextwriter writer) +13 system.web.ui.page.render(htmltextwriter writer) +29 system.web.ui.control.rendercontrolinternal(htmltextwriter writer, controladapter adapter) +66 system.web.ui.control.rendercontrol(htmltextwriter writer, controladapter adapter) +100 system.web.ui.control.rendercontrol(htmltextwriter writer) +25 system.web.ui.page.processrequestmain(boolean includestagesbeforeasyncpoint, boolean includestagesafterasyncpoint) +5827

it looks (based on posted code) error resulting adding button in page_load method. adding controls collection of placeholder ph, not inside form tag.

try placing placeholder tag inside form tag:

<body>   <form id="frm1" runat="server">     <asp:placeholder runat="server" id="ph" />     <asp:button runat="server" text="foobar" /> </body>

Comments

Post a Comment

Popular posts from this blog

javascript - Slick Slider width recalculation -

-
i'm trying add slide in panel on slick container css. carousel works except new width not being calculated when space has been added. recalibrate once advance next slide i'd happen each time panel opened or closed. i've tried adding both margin , padding, neither makes difference. ideas? https://jsfiddle.net/mhigley/dpf7mlpl/ html: <button type="button" id="button"><i class="fa fa-arrow-right"></i></button> <aside> <h2>slide in panel</h2> <ol> <li>list item</li> <li>list item</li> <li>list item</li> <li>list item</li> <li>list item</li> </ol> </aside> <main role="main"> <div class="sections"> <section> <article> <h2>first slide</h2> <p>lorem ipsum d...
Read more

jsf - PrimeFaces Datatable - What is f:facet actually doing? -

-
looking through primefaces code in app noticed following line: <f:facet name="header">#{trainsearch.traincount} trains</f:facet> it looks overriding header, makes sense, can explain me in little more detail? what happening line of code? complete code listed below: <p:datatable id = "results" value = "#{trainsearch.trains}" var = "train" rendered="#{not empty trainsearch.trains}" styleclass = "train-search-table horizontal-border"> <f:facet name="header">#{trainsearch.traincount} trains</f:facet> <p:column headertext = "train id"> <p:panelgrid columns="1" styleclass = "train-id-grid" layout = "grid"> <h:outputtext styleclass = "train-id-label" value="#{train.traini}"/> <h:outputtex...
Read more

angular2 services - Angular 2 RC 4 Http post not firing -

-
i trying fire post request app , it's not working, tried multiple ways. don't see request being fired under network tab in chrome. not sure problem is, appreciated. import { injectable } '@angular/core'; import { http, headers } '@angular/http'; @injectable() export class userservice{ private _url="users"; constructor(private _http: http){ } checkifusernameexists(username){ return this._http.get(this._url+"/"+username) .map(response => response.json()) } createuser(user){ let headers = new headers(); headers.append('content-type', 'application/json') console.log(json.stringify(user)); return this._http.post(this._url, json.stringify(user),{headers: headers}) .map(response => response.json()) } } first need capture error , solve error: this._http.post(this._url, json.stringify(user),{headers: headers}) .subscribe( ...
Read more