> 
> **Possible Duplicate:**  
> 
> [How to add namespaces in web.config file?](https://stackoverflow.com/questions/7586499/how-to-add-namespaces-in-web-config-file) 
> 
> 
> 

I am trying to add namespace in web.config file, so that I can use it in all web pages (in `code behind`). But it is not working.   

```
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace TestWeb
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Label1.BackColor = Color.Red;// It is not working.
        }
    }
}

```

This is `web.config` file

```
<?xml version="1.0"?>
<configuration>
  <system.web>
    <pages>
      <namespaces>
        <clear/>
        <add namespace="System.Drawing" />
      </namespaces>
    </pages>
  </system.web>
</configuration>

```

Edit

```
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TestWeb._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load(object sender, EventArgs e)
    {
        Label1.BackColor = Color.Red;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:label ID="Label1" runat="server" text="Label"></asp:label>
    </div>
    </form>
</body>
</html>

```