Develop Reference

Master Page Anchor tag Text to be written in a div on another page when clicked

I have a very peculiar need in my application. I have a master page on which there are many tags created and given the href attribute dynamically.
What I require is that when the user clicks on any of the tags, its text must be captured and written in an already specified div in the referenced content page. How can this be achieved????
I've seen many articles but it has got me nowhere. I would really appreciate some kind of help.

As per my understanding, you want to set the text of a div in the content page on click of the link in master page.
One way of doing this is as follows
Create an interface like below
public interface ITagable
{
public string Tag { set; }
}
Implemente this interface in all the content page which needs the tag to be displayed
public partial class YourPage : System.Web.UI.Page,ITagable
{
public string Tag
{
set
{
//set the value to your div
this.tagDiv.InnertText = value;
}
}
}
In the master page, on click event of the tag link set this property
protected void linkButtonTag_Click(object sender, EventArgs e)
{
LinkButton hyperLinkTag = sender as LinkButton;
if (Page is ITagable)
(Page as ITagable).Tag = hyperLinkTag.Text;
}

How to access MasterPage1 method in another ContentPage with MasterPage2 in asp.net?

I have Page1.aspx which has MasterPage1.master as its MasterPage and Page2.aspx which has MasterPage2.master as its MasterPage. I am showing Page2.aspx page in iframe (which is in Page1.aspx) Page2.aspx displays some items in ListView. After adding item to Cart(MyCartUserControl in MasterPage1.master) i want to call the Method say 'MyMethod()' which is in MasterPage1.master. in Page2.aspx
In Page2.aspx:
<%# MasterType VirtualPath="~/Sales/MasterPage1.master" %>
In Page2.aspx.cs
protected void UpdateShoppingCart()
{
Sales_MasterPage1 master = (Sales_MasterPage1)this.Master;
master.BindCart();
}
I know the above code will not work using 'this'. What is replaceable to 'this' keyword?
Help Appreciated!

Try below Code :
protected void UpdateShoppingCart()
{
Sales_MasterPage1 master = new Sales_MasterPage1();
master.BindCart();
}

Problem is the access modifier.
You might need to make it a public method because protected wont let you access it outside of that master class
public static void UpdateShoppingCart()
{
Sales_MasterPage1 master = new Sales_MasterPage1();
master.BindCart();
}
to call it from anywhere you can do:
Sales_MasterPage1.UpdateShoppingCart()

Access ASPX elements inside classes

I have a bunch of methods which manipulate the ASPX page elements and at this point it makes sense to encapsulate them into their own static object. However, it seems like I do not have access into the form elements outside of the ASPX page. Any ideas on how to go about this?

You need to pass the Page itself into the class, see the example below:
ASPX page
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtTest" runat="server" Text="Test" />
</div>
</form>
Code-Behind
protected void Page_Load(object sender, EventArgs e)
{
Process p = new Process(this);
string s = p.GetTextBoxValue();
}
Class
public class Process
{
public Page thePage { get; set; }
public Process(Page page)
{
thePage = page;
}
public string GetTextBoxValue()
{
TextBox tb = (TextBox)thePage.FindControl("txtTest");
return tb.Text;
}
}
Process is probably not the best name for the class, but this is purely a demo.
Also, passing the Page object into another class tight couples that class to the Page object. I would recommend reconsidering your design of the class you're trying to make to not rely on the Page object entirely.

If you really want to encapsulate functionality, I guess you best create a class in which you pass the relevant elements to the constructor.
If you are aiming on reuse in other pages, you could create a base page from which you inherit. Another option is to do stuff in a master page that you refer from your pages.
I think a more detailed question is required to give a more detailed answer.

You need to pass Page object as one of the parameters to your class methods, this way its elements will be accessible inside the class.
For example if you have a class like:
public class CMyDataClass {
public bool CompareText(System.Web.UI.Page i_oPage) {
TextBox oTextBox = i_oPage.FindControl("TextBox1");
return (oTextBox.Text == "My Data");
}
}
You can use it like this from the page:
CMyDataClass oMyDataClass = new CMyDataClass();
if (oMyDataClass.CompareText(this)) {
Response.Write("Ok!");
}

Dynamic user control controls are null on load

I have a base usercontrol in my ASP.Net app, There are HTML markup within this usercontrol that are set to runat="server" and id's. The problem I am having is when the usercontrol is loaded, the HTML markup is being returned as null
ASP.Net C# code:
public partial class webonlinecustombase : System.Web.UI.UserControl
{
public Event Event { get; set; }
public OnlineSystemPageCustom custompage { get; set; }
public OnlineSystemPageCustom.OnlineSystemPageHdr.OnlineSystemPageModule custommodule { get; set; }
public void Page_Load(object sender, EventArgs e)
{
string typeName = custommodule.ModuleInternetFile;
inpagelink.HRef = "#" + custommodule.ModuleName.Replace(" ", "").Replace("/", "");
modtitle.InnerText = custommodule.ModuleName;
Type child = Type.GetType(typeName);
UserControl ctl = Activator.CreateInstance(child) as UserControl;
if (ctl != null)
{
this.modsection.Controls.Add(ctl);
}
}
}
Here is the HTML Markup:
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="webonlinecustombase.ascx.cs" Inherits="IPAMIntranet.IPAM_Controls.webtemplatecontrols.webonlinecustombase" %>
<a id="inpagelink" runat="server"></a>
<span id="modtitle" runat="server" style="width:100%;text-align:left">Scientific Overview</span>
<div id="modsection" runat="server" style="width:100%;">
</div>
<p>Back to Top</p>
Why is the inpagelink and modtitle being returned as null?

I have seen this happen in web applications (not web sites) when changes are made to the source (especially setting runat=server on items that were not previously runat=server), but you don't switch to the designer view.
The way that I resolve this issue is to switch to design view and dirty a property in one of the fields. This usually causes VS to update the designer code-behind file.
You can double-check this file to ensure the controls have been added. If you check it prior to doing this, you should see that they are missing.

asp.net does'n have span class, so you cant do anything in code behind with it.
use LinkButton or HyperLink instead of
the other solution is to create span or a in code, something like this
var span = new HtmlGenericControl("span");
span.InnerHtml = "From<br/>Date";
span.Attributes["class"] = "blue";
placeholder.Controls.Add(span);
hope I helped :))

how to call a variable in code behind to aspx page

i know i have seen this but cant recall the correct way of doing it... basically i have a string variable called "string clients" in my .cs file.. but i wasn't to be able to pass it to my aspx page something like
<%=clients%>
please correct me, i do not recall or not sure how to do this. (new to c#) and when i googled it.. it was not clear.. or not many of these out there.. searched as
"asp.net c# <%= %> not consistent results.. maybe because i do not know how to call these..

The field must be declared public for proper visibility from the ASPX markup. In any case, you could declare a property:
private string clients;
public string Clients { get { return clients; } }
UPDATE: It can also be declared as protected, as stated in the comments below.
Then, to call it on the ASPX side:
<%=Clients%>
Note that this won't work if you place it on a server tag attribute. For example:
<asp:Label runat="server" Text="<%=Clients%>" />
This isn't valid. This is:
<div><%=Clients%></div>

In your code behind file, have a public variable
public partial class _Default : System.Web.UI.Page
{
public string clients;
protected void Page_Load(object sender, EventArgs e)
{
// your code that at one points sets the variable
this.clients = "abc";
}
}
now in your design code, just assign that to something, like:
<div>
<p><%= clients %></p>
</div>
or even a javascript variable
<script type="text/javascript">
var clients = '<%= clients %>';
</script>

For
<%=clients%>
to work you need to have a public or protected variable clients in the code-behind.
Here is an article that explains it:
http://msdn.microsoft.com/en-us/library/6c3yckfw.aspx

Make sure that you have compiled your *.cs file before browsing the ASPX page.

First you have to make sure the access level of the variable is protected or public. If the variable or property is private the page won't have access to it.
Code Behind
protected String Clients { get; set; }
Aspx
<span><%=Clients %> </span>

You need to declare your clients variable as public, e.g.
public string clients;
but you should probably do it as a Property, e.g.
private string clients;
public string Clients{ get{ return clients; } set {clients = value;} }
And then you can call it in your .aspx page like this:
<%=Clients%>
Variables in C# are private by default. Read more on access modifiers in C# on MSDN and properties in C# on MSDN

You can access a public/protected property using the data binding expression <%# myproperty %> as given below:
<asp:Label ID="Label1" runat="server" Text="<%#CodeBehindVarPublic %>"></asp:Label>
you should call DataBind method, otherwise it can't be evaluated.
public partial class WebForm1 : System.Web.UI.Page
{
public string CodeBehindVarPublic { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
CodeBehindVarPublic ="xyz";
//you should call the next line in case of using <%#CodeBehindVarPublic %>
DataBind();
}
}

I would create a property to access the variable, like this:
protected string Test
{
get; set;
}
And in your markup:
<%= this.Test %>

The HelloFromCsharp.aspx look like this
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="HelloFromCsharp.aspx.cs" Inherits="Test.HelloFromCsharp" %>
<!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">
<p>
<%= clients%>
</p>
</form>
</body>
</html>
And the HelloFromCsharp.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Test
{
public partial class HelloFromCsharp : System.Web.UI.Page
{
public string clients;
protected void Page_Load(object sender, EventArgs e)
{
clients = "Hello From C#";
}
}
}