how to call a variable in code behind to aspx page

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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

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心在旅途

2020-11-27 07:31
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>
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再見小時候

2020-11-27 07:35

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#";
        }
    }
}

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耶瑟儿～

2020-11-27 07:37
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
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