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The image will even appear in the Visual Studio design environment However, if you create a content page in another subfolder, the path is interpreted relative to that folder If the file doesn t exist there, you ll get a broken link instead of your graphic Even worse, you could conceivably get the wrong graphic if another image has the same filename This problem occurs because the <img> tag is ordinary HTML As a result, ASPNET won t touch it Unfortunately, when ASPNET builds your content page, this tag is no longer appropriate To solve your problem, you could try to think ahead and write your URL relative to the content page where you want to use it But this creates confusion, limits where your master page can be used, and has the unwelcome side effect of displaying your master page incorrectly in the design environment.

Browsers kick off the entire process by sending a request to IIS for a resource managed by ASP.NET. Initially, the request only contains the URL of the requested resource and various HTTP headers. No identifying information is sent in the initial request because browsers attempt to connect to resources anonymously when possible. Because the request comes in via a TCP/IP connection, IIS knows certain network information about the browser, such as the IP address.

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The ASP.NET object model fully supports inheritance as a method of providing additional functionality to existing controls. Given the object-oriented nature of the Framework, it is quite easy to add powerful functionality with just a few lines of code. ASP.NET provides two primary means of building controls: user controls and custom controls. Encapsulation or composition is another method available in ASP.NET to package functionality. Server control encapsulation is more applicable when focused on generic logic. User control encapsulation is more applicable when packaging application-specific logic. User controls have the benefit of declarative UI development and require less skill from the development staff. Custom controls provide bare-bones access to the ASP.NET plumbing, myriad design options, a superior deployment mechanism as an assembly, and better Designer support for the developer/user. Custom controls typically inherit from System.Web.UI.Control, System.Web.UI.WebControls. WebControl, or System.Web.UI.WebControls.WebPart and are built using one of two primary techniques: direct rendering or control composition. The HtmlTextWriter class provides a significant amount of assistance with rendering HTML content from a custom control through its Write() and Render() methods. Custom controls that use control composition speed development time by letting child controls handle their own HTML generation through the application of good object-oriented design principles.

Another quick fix is to make your image tag into a server-side control, in which case ASP NET will fix the mistake: <img src="bannerjpg" runat="server"/> This works because ASPNET uses this information to create an HtmlImage server control This object is created after the Page object for the master page is instantiated At this point, ASPNET interprets all the paths relative to the location of the master page You could use the same technique to fix <a> tags that provide relative links to other pages You can also use the root path syntax and start your URL with the ~ character For example, this <img> tag points unambiguously to the bannerjpg file in the MasterPages subfolder of the website: <img src="~/MasterPages/bannerjpg" runat="server" />.

IIS has the capability to allow or deny a request based on the IP address or domain from which the request originated Remember, the browser sends a request using the TCP/IP protocol, so IIS inherently has access to the IP and domain information for each request IIS generates a 403 Access Denied HTTP error whenever the request originates from a restricted IP address or domain, effectively keeping users from accessing information on the server You can use IP address and domain name restrictions in a couple of ways First, let s say that you have an internal application developed for a specific department or group You can use IP address restrictions to deny access to everyone in the company except the subset of IP s for the individuals who actually need access.

Unfortunately, this syntax works only with server-side controls. If you want a similar effect with ordinary HTML, you need to change the link to a full relative path incorporating your domain name. This makes for ugly, unportable HTML, and it s not recommended.

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