I have an .aspx file that has 3 drop down lists:
ddlMake
ddlModel
ddlColour
i have a Page_Load function but i cant acces them in the Page_Load function...
using System;
using System.Collections.Generic;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
namespace NorthwindCascading
{
public partial class _IndexBasic : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
CarService service = new CarService();
List<string> Makes = service.GetCarMakes();
ddlMake.DataSource = Makes;
ddlMake.DataBind();
ddlMake.Items.Insert(0, " -- Select Make -- ");
}
}
}
}
I have added the code-behind file manually so i guess i am missing something... it just says that the ddlMake element is not defined in current context...any suggestions?
Rather than figure out what went wrong. I suggest you just simply delete the file and re-do what you have done again. Will save your time....
Make sure your CodeFile/CodeBehind attribute in the page directive is pointing to the correct file. If so, make sure the Inherits attribute in the page directive is naming the correct class name.
If you added the code behind manually, then the _IndexBasic.designer.cs probably doesn't contain the protected members, which would be why you cannot see them here. Or, your aspx is not referencing this as your codebehind.
Right-click on your .aspx page and hit Convert to Web Application - that will create and populate the designer file.
Related
I have an asp.net web form website in which i use URL routing
the thing is when ever I try ti navigate to a matched route e.g "http://localhost:51878/brand/adidas" it doesn't open the specified aspx file it shows HTTP Error 404.0 - Not Found and navigates to D:\Websites\Website\brand\adidas
update: I tried adding break points to the global.asax.cs file apparently it doesn't even go through the Application_Start function
here's my
global.asax`
<%# Application Language="C#" CodeBehind="Global.asax.cs" %>
and here's my global.asax.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Routing;
using System.Web.Security;
using System.Web.SessionState;
using System.Data;
using System.Data.SqlClient;
public partial class Global : HttpApplication
{
protected void Application_Start(object sender, EventArgs e)
{
RegisterRoutes(RouteTable.Routes);
}
protected void RegisterRoutes(RouteCollection routes)
{
routes.MapPageRoute("brandsRoute", "brand/{brand}", "~/brand.aspx");
}
}
would u please tell me what I'm doing wrong
The code you posted looks fine, except for the erroneous > character under your using statements, which may be causing your code not to build, and perhaps you are running a last good build version that doesn't include your new route.
I have an asp.net page called prequal.aspx with a codebehind of prequal.aspx.cs. It works. I want to separate out each client code from this page into their own partial files (to reduce chance of modifying the wrong one by mistake later.) Both .cs files begin as such:
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class prequal : System.Web.UI.Page
{
When I put one of the clients code into its own file, it compiles fine but I get the following error when I try to view the page:
CS1061: 'ASP.prequal_aspx' does not contain a definition for 'lnkLanguage_Click' and no extension method 'lnkLanguage_Click' accepting a first argument of type 'ASP.prequal_aspx' could be found (are you missing a using directive or an assembly reference?)
prequal.aspx has this:
<asp:LinkButton id="lnkLanguage" onclick="lnkLanguage_Click" runat="server" CausesValidation="False">English / En Español</asp:LinkButton>
prequal.aspx.cs has this:
protected void lnkLanguage_Click()
{
// alternate preferred language
if (Session["lang"].ToString() == "spa")
{
Session["lang"] = "eng";
}
else
{
Session["lang"] = "spa";
}
populateQuestions();
}
populateQuestions() will call other code in prequal.aspx.cs which calls code in prequal-client1.aspx.cs. The code works before I split it up so am I going about creating separate partial class files incorrectly? Or is the issue something else that I am unaware of yet?
I believe the signature for lnkLanguage has to be:
protected void lnkLanguage_Click(object sender, EventArgs e)
{
//...
}
I try to create a custom control which inherits from GridView ( using tut http://msdn.microsoft.com/en-us/library/yhzc935f(v=vs.100).aspx ). After each build Visual Studio keeps replacing my reference to my custom namespace with its own in Default.aspx.designer.cs
protected global::System.Web.UI.WebControls.WebParts.GridViewCustom GridView1;
each time I did put
protected GridViewCustom.GridViewCustom GridView1;
Why ?
In assembly.cs I have added
using System.Web.UI;
...
[assembly: TagPrefix("GridViewCustom", "GridViewCustom")]
In default.aspx I have:
<asp:GridViewCustom ID="GridView1" runat="server">
</asp:GridViewCustom>
This is my source code for the control (source file is in App_Code):
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace GridViewCustom
{
[DefaultProperty("Text")]
[ToolboxData("<{0}:GridViewCustom runat=server></{0}:GridViewCustom>")]
public class GridViewCustom : System.Web.UI.WebControls.GridView
{
[Bindable(true)]
[Category("Appearance")]
[DefaultValue("")]
[Localizable(true)]
public string Text
{
get
{
String s = (String)ViewState["Text"];
return ((s == null) ? String.Empty : s);
}
set
{
ViewState["Text"] = value;
}
}
protected override void RenderContents(HtmlTextWriter output)
{
output.Write(Text);
}
}
}
I'm having the same problem. One option is suggested by the autogenerated designer file -- remove the declaration from the .designer.cs file and explicitly declare it in your codebehind file.
Otherwise, you might try looking into the solution outlined in this question: Visual Studio 2010 keeps changing my winforms control.
Update:
Having registered my controls globally in a web.config file, I just experimented with changing the tagPrefix declaration to something unique, as opposed to an existing prefix shared by other custom controls, and suddenly everything is fine. The strange thing is that I no longer see the declaration in the designer file, but it still works.
Still confusing.
Is it possible to write a System.Web.UI.Page and stored in an assembly?
And how can I make iis call that page?
So I will go deeply...
I'm writing a class like that:
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Runtime.InteropServices;
using System.Reflection;
using WRCSDK;
using System.IO;
public partial class _Test : System.Web.UI.Page
{
public _Test()
{
this.AppRelativeVirtualPath = "~/WRC/test.aspx";
}
protected void Page_Load(object sender, EventArgs e)
{
Response.Write("You are very lucky!!!");
}
}
That are stored into an assembly.
So Now How can I register that assemply and obtain that http://localhost/test.aspx invoke that class?
Thanks.
Bye.
You'll want to use an HttpHandler or HttpModule to do this.
Registering the assembly is just like registering any assembly -- just define that class in a code file and have the compiled DLL in your bin directory.
Then, as an example, you can create a IHttpHandlerFactory:
public class MyHandlerFactory : IHttpHandlerFactory
{
public IHttpHandler GetHandler(HttpContext context, ........)
{
// This is saying, "if they requested this URL, use this Page class to render it"
if (context.Request.AppRelativeCurrentExecutionFilePath.ToUpper() == "~/WRC/TEST.ASPX")
{
return new MyProject.Code._Test();
}
else
{
//other urls can do other things
}
}
.....
}
Your web.config will include something like this in the httpHandlers section
<add verb="POST,GET,HEAD" path="WRC/*" type="MyProject.Code.MyHandlerFactory, MyProject"/>
Not sure what you're after here. If you set up a deployment project, there's a setting to have it merge all the dll files into a single assembly. Is that what you want? Either way, if you want to reuse the same code behind class for several aspx pages, it is the page declarative (1st line of code in the aspx) that you must change.
Few options
1. You can refer to this assembly as part of visual studio references
2. Use relfection to load the assembly and class from your test ASAPX page.
I'm attempting to start using DynamicData functionality in a previously existing website. Basically I'm following this tutorial. When I got to the part about creating the Field Templates I decided I could probably create a new site with the Dynamic Data stuff built in, and then just copy the folder over.
Unfortunately when I do that and try to compile I get the error "Could not load type..." for just about every .ascx file in the DynamicData directory. I named the "new" project the same as the pre-existing site so that the namespace would be the same... but I can't think of what else I could be missing.
Everything looks ok, except that the *.ascx.Designer.cs files are showing inside the Solution Explorer. I tried deleting one and then copying that file back into just the directory but it didn't work. I'm assuming I need to do something special with those so that Visual studio handles them properly and can compile?
Here is one of the .aspx files:
<%# Control Language="C#" CodeBehind="FilterUserControl.ascx.cs" Inherits="EService.FilterUserControl" %>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true"
EnableViewState="true" ontextchanged="new">
<asp:ListItem Text="All" Value="" />
</asp:DropDownList>
Here is the matching .cs file:
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using System.Web.DynamicData;
namespace EService
{
public partial class FilterUserControl : System.Web.DynamicData.FilterUserControlBase
{
public event EventHandler SelectedIndexChanged
{
add
{
DropDownList1.SelectedIndexChanged += value;
}
remove
{
DropDownList1.SelectedIndexChanged -= value;
}
}
public override string SelectedValue
{
get
{
return DropDownList1.SelectedValue;
}
}
protected void Page_Init(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
PopulateListControl(DropDownList1);
// Set the initial value if there is one
if (!String.IsNullOrEmpty(InitialValue))
DropDownList1.SelectedValue = InitialValue;
}
}
}
}
And here is the .ascx.designer.cs file:
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by a tool.
// Runtime Version:2.0.50727.1433
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
namespace EService
{
public partial class FilterUserControl
{
protected System.Web.UI.WebControls.DropDownList DropDownList1;
}
}
EDIT: If I create the file in the website, then copy the contents from the temporary site I created it seems to compile just fine. Really have no idea what the issue is here... I tried manually modifying files to match the results of copying and they still wouldn't work unless I actually created them in the site. It's just bizarre...
The problem was due to the temporary site creating the <%# Control > definitions with the CodeBehind property instead of the CodeFile property. For some reason pages in the actual website will only compile when CodeFile is declared...
DD will work with Either Website or Web Application. however when copying in from an other project the types need to be the same otherwise it's lot of editing to convert swee my article here Getting Dynamic Data Futures filters working in a File Based Website.