Change app pool settings iis express

You may face an Asp.Net error while running your Web Application Project in Debug mode using IIS Express:

“an setting has been detected that does not apply in integrated managed pipeline mode”

This error means that the framework expects the App Pool to be running the Managed Pipeline Mode as Classic. In Classic mode, managed application events are executed by using ISAPI.

There are other ways to suppress the error by making an entry in the Web.Config file to set the validateIntegratedModeConfiguration to false. But it is better to set the correct application pool.

Select your Project under the Solution and press F4 on your keyboard to access the Project Properties as shown below:

Also, you can enable/disable the Authentication for Anonymous and Windows modes.

Check this post on how to create Virtual Directory in IIS Express.


Take screen-shot of webpage with Firefox and Geckodriver using Selenium with C#

Gecko is a web browser engine used in many applications developed by Mozilla Foundation and the Mozilla Corporation. It is a proxy for using W3C WebDriver-compatible clients to interact with Gecko-based browsers, in this case, Firefox. Gecko Driver acts as the bridge between your script in Selenium and the Firefox browser.

Firefox browser implements the WebDriver protocol using an executable called GeckoDriver.exe. This executable starts a server on your system through which all interaction happens. It translates calls into the Marionette automation protocol by acting as a proxy between the local and remote ends.

To generate the screenshot, the web page will be loaded in the Firefox WebDriver and the height of the window adjusted appropriately. Every GeckoDriver process spawns 4 Firefox processes which you can check through Task Manager. The Preview generation logic can be written as a Web Service and hosted on IIS. The AppPool would require to be run with LocalSystem permission to enable communication between GeckoDriver and Firefox WebDriver.

The below code will run Firefox WebDriver in headless mode:

public static IWebDriver driverWeb;
public static FirefoxOptions optionsFirefox;
static int totalWidth = 1024;
static int additionalHeight = 220;
static int additionalHeightOffset = 2180;
static int normalHeight = 768;
static int explicitWaitTime = 5;

Setup browser profile:

static Firefox()
		optionsFirefox = new FirefoxOptions();
		FirefoxProfile profile = new FirefoxProfile();
		profile.SetPreference("permissions.default.desktop-notification", 1);
		profile.AcceptUntrustedCertificates = true; //Accept SSL certificates which have expired
		profile.AssumeUntrustedCertificateIssuer = false; //Firefox assumes untrusted SSL certificates are coming from untrusted issuer 
		profile.SetPreference("general.useragent.override", Convert.ToString(ConfigurationManager.AppSettings["driverUserAgent"]));
		profile.SetPreference("layout.css.devPixelsPerPx", "0.9");
		optionsFirefox.Profile = profile;
	catch (Exception e)
		throw e;

Initialize Web Driver:

public static void initializeWebDriver()
		FirefoxDriverService service = FirefoxDriverService.CreateDefaultService(Convert.ToString(ConfigurationManager.AppSettings["driverPath"]));
		service.HideCommandPromptWindow = true;
		driverWeb = null;
		driverWeb = new FirefoxDriver(service, optionsFirefox, new TimeSpan(0, 0, Convert.ToInt16(ConfigurationManager.AppSettings["setDriverTimeout"])));
		driverWeb.Manage().Timeouts().ImplicitWait = new TimeSpan(0, 0, Convert.ToInt16(ConfigurationManager.AppSettings["setPageLoadTimeout"]));
		driverWeb.Manage().Timeouts().PageLoad = new TimeSpan(0, 0, Convert.ToInt16(ConfigurationManager.AppSettings["setPageLoadTimeout"]));
		//log exception.

Generate Preview:

//This method will be called from a Rest Service and returns a byte array for image.
public byte[] getImage()
	byte[] imageDataWeb;
		if (driverWeb == null)
			lock (padlockWeb)
				//double lock check for thread-safety.
				if (driverWeb == null)

		if (getHttpResponseCode(link))
			lock (driverWeb)
				/*Start Area: Get rendered page height/width and adjust browser accordingly*/
					var javaScriptExecutor = driverWeb as IJavaScriptExecutor;
					var waitPage = new WebDriverWait(driverWeb, TimeSpan.FromSeconds(explicitWaitTime));
					bool readyCondition(IWebDriver webDriver) => (bool)javaScriptExecutor.ExecuteScript("return document.readyState == 'complete'");

					string HeightScript = "return document.body.scrollHeight";
					long totalHeight1 = (long)javaScriptExecutor.ExecuteScript(HeightScript);
					int totalHeight = (int)totalHeight1;
					if (totalHeight == 0)
						totalHeight = normalHeight + additionalHeight;
						if (totalHeight <= additionalHeightOffset)
							totalHeight += additionalHeight;
					driverWeb.Manage().Window.Size = new Size(totalWidth, totalHeight);
				catch (Exception e)
					_txtSource.TraceEvent(TraceEventType.Error, 0, e.Message);
					_txtSource.TraceEvent(TraceEventType.Error, 0, e.StackTrace);

					driverWeb.Manage().Window.Size = new Size(totalWidth, normalHeight + additionalHeight);
				/*End Area: Get rendered page height/width and adjust browser accordingly*/

				screenshot = ((ITakesScreenshot)driverWeb).GetScreenshot().AsByteArray;

				if (screenshot.Length == 0)
					throw new Exception("Website not responding.");

				driverWeb.Manage().Window.Size = new Size(totalWidth, normalHeight);
				return screenshot;
			imageDataWeb = returnErrorImage(); //return error image.
		return imageDataWeb;

	catch (Exception e)
		//log exception
		imageDataWeb = doExtractEmptyPage();
		return imageDataWeb;
		imageDataWeb = null;

Create Virtual Directory in IIS

Create the Website under IIS as shown below on port 80 so it can be accessed using http and give the appropriate hostname as required. The hostname should be available in the DNS records to access over Internet/Intranet.

Create the virtual directory as shown below. Use the default Pass-through authentication for demo purpose. You can also use Physical Path credentials on your folder if required and manage using Connect as button.

The below image shows how the Virtual Directory will look like under your website in IIS. So if you have a file saved under the Attachments folder under C:\Data\Attachments\doc1.docx, the URL to access the document will be http://mywebsite/attachments/doc1.docx. The folder can also be created on another physical drive on the same Server or can also be accessed using a UNC path.

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Create Virtual directory in Visual Studio 2017 IIS Express

You may be facing a scenario where the Images folder of your Project is hosted in another directory on your machine e.g. C:\Data\Images and not under the Project directory structure. In this case, if you need to check whether the Images are loading correctly, you’ll need to create a Virtual directory in your Web application/MVC/WebAPI Project.

Follow the below steps:

1. Right-click on your Project properties and go to the Web tab and provide the URL for the required Virtual directory and click on the button Create Virtual directory. This option edits the ApplicationHost.config file.

2. Run the application and right-click on the IIS Express icon in the status-bar notification tray. Select your website and open the config file.

3. Look for the site tag and find your website and you’ll find the Virtual directory nested tag. Edit the path and physicalPath attribute to the folder on your machine as shown below:

<site name="MyApi" id="2">                 
<application path="/" applicationPool="Clr4IntegratedAppPool">
<virtualDirectory path="/" physicalPath="C:\MyApi" />                 
<application path="/uploads" applicationPool="Clr4IntegratedAppPool">                     
<virtualDirectory path="/" physicalPath="C:\Data\Images\uploads" />                 
<binding protocol="http" bindingInformation="*:62216:localhost" />                 

After making these changes, refresh the app to view the images in your app via localhost.

To know how to create a Virtual Directory in IIS for a website, check this post.

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TLS version handling with http web request CSharp

Since you’re reading this, probably your C# code broke the connection to the website or a third-party API you’re hitting using the HttpWebRequest. The below code shows one such scenario where my application code broke which is running in .net framework 4.0. The company running the API upgraded their security with the TLS version upgrade to 1.2.

The exception that you’re seeing as below while trying to call GetResponse():

The request was aborted: Could not create SSL/TLS secure channel.

Uri url = new Uri(Link);
HttpWebRequest http = (HttpWebRequest)WebRequest.Create(url.ToString());
HttpWebResponse resp = (HttpWebResponse)http.GetResponse();
returnValue = Convert.ToInt32(resp.StatusCode);

HTTPS relies on a family of lower level security protocol implementations called transport level security (TLS), each using different cryptographic algorithms. Transport Layer Security (TLS) is a cryptographic protocol used to establish a secure communications channel between two systems. Anything that is using TLS standard below TLS 1.2 is considered to be non secure because these older encryption algorithms have been cracked at some point. The TLS standards keep evolving and TLS 1.3 is in the works.

Each .net framework supports TLS version 1.2 in the following ways:

  • .Net 4.5 and above: Add the below line of code before making the web request in your code. Some blogs say .Net 4.6 and above support it by default and no code changes are required but as I tried it myself, it doesn’t work.
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
  • .Net 4.0: This framework does not support the enumeration as in the latest frameworks, the below line of code helps achieve that:
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

Older frameworks do no support the latest TLS version, so it’s better to upgrade your application. Also, as a good security practice do not use the fallback code as shown below:

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

Another good point to consider upgrading your application is to check if Microsoft still supports the .Net framework you’re using.

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Show image when mouse over on radio button HTML CSS

This post shows the scenario where you need to show an image when doing a mouse-over on a radio button in html. You can customize the code further as per your requirement.

In your html or server side code file, add the below style under the head tags:

    span .hover-img { 
    span .hover-img span {
      position:absolute; left:-9999px; top:-9999px; z-index:9999;
    span:hover .hover-img span { 
      top: 20px; 

Add the below html code under the body tag of the file as below:

<span><div class="hover-img"><font face="Arial"><input type="radio" value="option1" name="myradio"><font size="2">Option 1
</font><span><img src="Mouseover1.png" alt="image" height="100" /></span></div></span><br />

<span><div class="hover-img"><font face="Arial"><input type="radio" value="option2" name="myradio"><font size="2">Option 2
</font><span><img src="Mouseover2.png" alt="image" /></span></div></span>

Run the final code in a browser to see the results.

ASP.Net Server side Http Web Request with Custom Headers

This post shows how to make HttpWebRequest from Asp.Net page using c#. Here, the requirement is to call an external API with Custom headers and sending json data in the page_load method. Reading the Html response from the stream and write it on the Aspx page. Gluid is the Global Unique Identifier generated in c#.

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL + "?pID=" + pID);

NameValueCollection nameValueCollection = new NameValueCollection
{ "firstName", firstName },
{ "lastName", lastName },
{ "x-requestKey", Gluid },
request.Accept = "application/json";
request.ContentType = "application/json";
request.Method = "POST";
request.AllowAutoRedirect = true;
byte[] bytes = Encoding.ASCII.GetBytes(dataSent);

request.ContentLength = bytes.Length;
Stream os = request.GetRequestStream();
os.Write(bytes, 0, bytes.Length); //Push it out there

Stream responseStream = httpWebResponse.GetResponseStream();
StreamReader streamReader = new StreamReader(responseStream, Encoding.UTF8);
string html = streamReader.ReadToEnd();

dataSent is the is json data read from a json file and sent as bytes.

For generating Gluid, use the following C# code:

public string GetUniqueIdentifier()
var guid = Guid.NewGuid().ToString();
return guid;

For similar Http POST request using jquery ajax, check out this post.