In recent days I was working on a project want to replace \r\n to a new character but it was giving very strange behaviour. It was not replacing proper. Let’s create that scenario. I have written following code.

using System;

namespace WebApplication1
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string sample = @"This is string for replacing new
                                 line \r\n This may not work";
            Response.Write(sample.Replace(@"\r\n",@"<br />"));
        }
    }
}

If you see the above code looks like it should work fine. But when you run this in browser in some environment it working fine and in some environment it was not working fine. Just like below.

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Visual studio 2012 is one of best IDE I have ever used. Everyday I am discovering something new with that IDE which is more productive. Today I have discovered “Closed All But Pinned” feature. I thought It’s a good idea to write a quick tip post.

Problem with Earlier Version:

Earlier we used to have “Close All But This” feature from Visual Studio 2008 which will close all the files except the that file. But what we should do If we need to have more than one file opened. There was not way for it in Visual Studio 2008.

So if we have requirement like above situation where we need to kept open more than one file. This features comes quite handy. You just have to pin files that you want it to be opened.

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With the release of ASP.Net 4.5 web forms there are tons of features added in the ASP.Net and Unobtrusive validations support is one of them. We have already seen that kind of validation in ASP.Net MVC and now we are going to have that in ASP.Net web forms. In this post I am going to explain how its works and how its different from earlier versions.

How validation was working with earlier versions?

In the earlier versions of ASP.Net it was working via putting a JavaScript for that. Let’s take a simple example. I have putted three things here. A textbox, required field validator and a button like following.

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In this post We are going to see How Knockout, ASP.Net Web API and ASP.Net works together smoothly. There are lots many examples of ASP.Net MVC,Web API and Knockout.js available on web working together  nicely. So I thought it will be a good idea to write a blog post about how ASP.Net Web API, ASP.Net Web Forms,Knockout.js works together and how we can create simple data binding with Knockout.js.

ASP.Net Web Forms:

As we all know ASP.Net Web Forms is one of premier development technology widely use in creating web sites and web applications. ASP.Net Web Forms allow to create dynamic websites using event driven model. It is one of the easiest way to create web applications and web sites.

ASP.Net Web API:

ASP.Net Web API is a framework that allows to build HTTP Service that reach a broad range of clients including browsers and mobile devices.It provides very easy way to write restful http services. Its can be access by any type of client over HTTP protocol. Client can make a GET, PUT,POST and DELETE request based on its requirement and get the response appropriately.

Knockout JS:

As per knockoutjs.com, Knockout is a JavaScript library that helps you to create rich, responsive display and editor user interfaces with a clean underlying data model. It provides a way to declarative bindings using an ‘Observable’ view model on browser. It supports two way bindings.

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If you are ASP.NET programmer then you already know about Server.MapPath. It is used to map a physical location on webserver for asp.net.  You can find more information about Server.MapPath from the following location.

http://msdn.microsoft.com/en-us/library/ms524632(v=vs.90).aspx

You can still use that in WCF(Windows Communication Foundation) service http bindings. As we know WCF Service can use other non http bindings like TCP/IP,MSMQ and Named Pipe. At that time HttpContext of WCF will be none so server.mappath will not be available as current context is not available. Because its a child class of HttpContext.Current.

HostingEnvironment.MapPath :

HostingEnvironment.MapPath works on all kind of bindings. So when you have other bindings like TCP/IP and MSMQ it will be available as it is inherited from the System.Web.Hosting namespace. You can find more information from below MSDN link.

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