I have an aspx application. I have defined a dropdownlist in the .aspx file and try to load some data into it from database in .aspx.cs file. But I am getting the error in .aspx.cs as "DropDownList1" does not exists in the current context.
Below is the code:
Wiki.aspx:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Wiki.aspx.cs" Inherits="FinalProj2._Wiki" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
body { margin: 4%; }
#space1 { height:1em; }
#space2 { height:1em; }
</style>
</head>
<body>
<h1>WIKI</h1>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="DropDownList1" runat="server" Width="100%"></asp:DropDownList>
</div>
<div id="space1"></div>
<asp:ListBox ID="ListBox1" runat="server" AutoPostBack = "true" Height = "150px" Width = "100%"></asp:ListBox>
<div id="space2"></div>
<asp:TextBox ID="TextBox2" runat="server" Height="250px" Width="100%" TextMode="MultiLine"></asp:TextBox>
</form>
</body>
</html>
Wiki.aspx.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Security;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using FinalProj2.Controllers;
namespace FinalProj2
{
public partial class _Wiki : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
FinalProj2.Models.DataClasses1DataContext db = new FinalProj2.Models.DataClasses1DataContext();
Response.Write("<br/>Page.User.Identity.Name: " + Page.User.Identity.Name);
Response.Write("<br/>Page.User.Identity.IsAuthenticated: " + Page.User.Identity.IsAuthenticated);
Response.Write("<br/>Page.User.Identity.AuthenticationType: " + Page.User.Identity.AuthenticationType);
var query = from meet in db.Meets
select meet.Summary;
// where meet.Meeting_ID = (from meet_emp in db.Meet_Emps
//where meet_emp.Employee_Name == Page.User.Identity.Name
//select meet_emp.Meeting_ID)
DropDownList1.DataSource = query;
DropDownList1.DataBind();
}//end
}
}
What could be the possible reason. According to me I feel everything is fine as had used the same way for a list box into another application.
Make sure you have no files that accidentally try to inherit or define the same (partial) Mlass as other files.
Thus no other code behind file should have same signature in FinalProj2 Namespace.
public partial class _Wiki : System.Web.UI.Page
Related
I've searched this error in all google results, but I can't find a solution.
I have this WebForm:
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="LoTest.aspx.cs" Inherits="-.-.-.LoTest" %>
<%# Register TagPrefix="ajax" Namespace="MagicAjax.UI.Controls" Assembly="MagicAjax" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<ajax:AjaxPanel ID="ajaxLG" runat="server" AjaxCallConnection="Synchronous">
<asp:Button ID="btnTest" runat="server" CssClass="button" ToolTip="gin." Text="LogIn" OnClick="btnTest_Click"></asp:Button>
</ajax:AjaxPanel>
</div>
</form>
</body>
</html>
Code Behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using MagicAjax.UI;
using MagicAjax;
namespace -.-.-
{
public partial class LoTest : AjaxPage
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnTest_Click(object sender, EventArgs e)
{
AjaxCallHelper.WriteAlert("Test msg");
}
}
}
The web.config:
<httpModules>
<add name="MagicAjaxModule" type="MagicAjax.MagicAjaxModule, MagicAjax"/>
</httpModules>
In the Line “AjaxCallHelper.WriteAlert("Test msg");” throws the error:
Using the AjaxCallHelper write methods outside of an AjaxCall is not allowed.
In IE, just add the site to the compatibility view and that´s all.
Seems like if AjaxMagix.dll works with older elements of the explorer.
In Google Chrome doesn´t work.
I have implemented the following with my two resource files, one for English (LocalStrings) and one for German (de-DE). When I change the drop-down it does not change the language. No errors are raised, not by Visual studio or Firebug. Any Advice?
<%# Page Language="C#" AutoEventWireup="false" CodeFile="Default.aspx.cs" Inherits="_Default" uiculture="auto" Culture="auto:de-DE" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<asp:Label ID="Label1" runat="server" meta:resourcekey="Label1" Text="<%$ Resources:LocalStrings, LastName %>"></asp:Label>
<br />
<br />
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem Value="LocalStrings">English</asp:ListItem>
<asp:ListItem Value="de-DE">German</asp:ListItem>
</asp:DropDownList>
</form>
</body>
</html>
code-behind
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Globalization;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected override void InitializeCulture()
{
string cult = Request.Form["DropDownList1"];
if (cult != null)
{
String selectedLanguage = cult;
UICulture = selectedLanguage;
Culture = selectedLanguage;
Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(selectedLanguage);
Thread.CurrentThread.CurrentUICulture = new CultureInfo(selectedLanguage);
}
base.InitializeCulture();
}
}
SOLVED
The format of resource files are ResourceName.culture.resx
Create a resource file in the App_GlobalResources folder called Main.resx. This is for the default culture ( ie Invariant )
Then create a resource file Main.en-US.resx
This is where all the resources for en-US culture will live, and so on.
Main.resx
Main.en.resx
Main.en-US-resx
Main.en-AU.resx
Main.fr.resx
Main.fr-FR.resx
etc.
To access this from the webpage use the syntax
<%$ Resources:Main, Email %>
Don't worry around the culture, the system will work it out. It will exact match first ( en-US ), then work up to that's cultures parent ( en ), parent's parent ( Invariant ).
Change the name of "Main" to suit your needs
I have a simple form with a dropdown list binded to a string array (as a simple example). The form is submitted when the user clicks a button.
I want to query the selected item in the list. I read the SelectedValue member of the dropdownlist which always contains the default item no matter what I select in the form.
I can't use autopostback on the list as in my production environment the form is displayed in dynamic div using jquery.
If I remove the binding and add the list items in the asp file using ListItems tags, than it magically works.
My sample asp code:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
<br />
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
</div>
</form>
</body>
</html>
And the code-behind file:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string[] items = { "bindItem1", "bindItem2", "bindItem3" };
DropDownList1.DataSource = items;
DropDownList1.DataBind();
}
protected void Button1_Click(object sender, EventArgs e)
{
string text = TextBox1.Text;
string item = DropDownList1.SelectedValue;
}
}
In the page_load do the databinding only if Page.IsPostBack==False.
if (!IsPostBack)
{
//do the data binding
}
Your code now on every page load, will bind the data again and again, so the selected value is "not" changing.
I'm building a product editor webpage using visual C#. I've got an image uploader popping up using fancybox, and I need to get the info from my fancybox once submitted to go back to the first page without clearing any info. I know I need to use ajax but how would I do it?
<%# Page Language="C#" AutoEventWireup="true" CodeFile="uploader.aspx.cs" Inherits="uploader" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body style="width:350px; height:70px;">
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<div style="width:312px; height:20px; background-color:Gray; color:White; padding-left:8px; margin-bottom:4px; text-transform:uppercase; font-weight:bold;">Uploader</div>
<asp:FileUpload id="fileUp" runat="server" />
<asp:Button runat="server" id="UploadButton" text="Upload" onclick="UploadButton_Click" />
<br /><asp:Label ID="txtFile" runat="server"></asp:Label>
<div style="width:312px; height:15px; background-color:#CCCCCC; color:#4d4d4d; padding-right:8px; margin-top:4px; text-align:right; font-size:x-small;">Click upload to insert your image into your product</div>
</div>
</form>
</body>
</html>
CS so far
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Configuration; // Add to page
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data; // Add to the page
using System.Data.SqlClient; // Add to the page
using System.Text; // Add to Page
public partial class uploader : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void UploadButton_Click(object sender, EventArgs e)
{
if (fileUp.HasFile)
try
{
fileUp.SaveAs("\\\\london\\users\\DP006\\Websites\\images\\" +
fileUp.FileName);
string imagePath = fileUp.PostedFile.FileName;
}
catch (Exception ex)
{
txtFile.Text = "ERROR: " + ex.Message.ToString();
}
finally
{
}
else
{
txtFile.Text = "You have not specified a file.";
}
}
}
I have two input text boxes which are decimal.
The sum of the two inputs cannot be more than 100. When input1 is 40, input2 cannot be more than 60.
I need to do everything in client side and need to allow client to enter any value. If the entered value is more than the limit, I need to show the validator error message:
Page.isValid = false
Now I have two separate validator for each input box but I don't know how to change the valueToCompare of two validators in client side.
Please advise,
Thanks
You should look into using the CustomValidator control. Here's an article that walks you through using it.
Your code could look something like this:
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs"
Inherits="WebApplication1._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function validateTextBoxen(sender, args) {
// You'll have more thorough validation, I'm sure
var value1 = parseFloat(
document.getElementById('<%=textBox1.ClientID%>').value);
var value2 = parseFloat(
document.getElementById('<%=textBox2.ClientID%>').value);
args.IsValid = (value1 + value2) < 100;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="textBox1" runat="server" />
<asp:TextBox ID="textBox2" runat="server" />
<asp:CustomValidator runat="server" EnableClientScript="true"
OnServerValidate="onCustomValidation" ID="customValidator"
ErrorMessage="Invalid!"
SetFocusOnError="true" ClientValidationFunction="validateTextBoxen"/>
<asp:Button runat="server" OnClick="button_Click"/>
<asp:Literal runat="server" ID="placeholder" />
</div>
</form>
</body>
</html>
Code-behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1
{
public partial class _Default : System.Web.UI.Page
{
protected void onCustomValidation(
object sender, ServerValidateEventArgs e)
{
float value1 = 0f;
float value2 = 0f;
if (!float.TryParse(textBox1.Text, out value1)
|| !float.TryParse(textBox2.Text, out value2)
|| value1 + value2 > 100f)
{
e.IsValid = false;
}
}
protected void button_Click(object sender, EventArgs args)
{
placeholder.Text = Page.IsValid ? "Valid" : "Invalid";
}
}
}
Nowadays the best way to validate HTML forms IMO is with a jQuery plugin like this one.
On client side, on the click of button, use ClientClick property, and set it to javascript function name to validate the input
e.g.
<asp:Button ID="btnSubmit" OnClientClick=" return validate()" runat="server" Text="Submit" ></asp:Button>
And write a validate() function in javascript, which check the sum of both inputs