ASP.NET

I am using this code in my asp.net MVC boilerplate application

I was following the article of adding rich text editor as explained here (How to use Rich text editor (CKEditor) in MVC), but when I am submitting CKEditor data to the controller, I am getting this error 

A potentially dangerous Request.Form value was detected from the client

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I am passing Select List from ViewBag in controller to partial View, like I used to do , but it is not showing SelectList on partial View when code is pushed on server, while it works when running code locally, here is the code

Controller

Hi, I have just created a project using Visual Studio 2015 & selected MVC template, but When I tried to build the project and executed it in the browser, I got the error as below

The following errors occurred while attempting to load the app.
- No assembly found containing an OwinStartupAttribute.
- No assembly found containing a Startup or [AssemblyName].Startup class.
To disable OWIN startup discovery, add the appSetting owin:AutomaticAppStartup with a value of "false" in your web.config.
To specify the OWIN startup Assembly, Class, or Method, add the appSetting owin:AppStartup with the fully qualified startup class or configuration method name in your web.config.

Here is the Image of the error

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How can I disable this debugging(image below), I'm using Visual Studio 2017 Community edition and don't like the new chrome window whenever I click Debug in Visual Studio using Chrome browser

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 I have make a chart.js in my website to display chart showing demand of a fruit over date range using this script below :

<div class="chart-wrapper" style="height:200px;margin-top:40px;">
    <canvas id="main-chart" class="chart" height="100"></canvas>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js">
</script>
<script>
    var ctx = document.getElementById("main-chart").getContext('2d');
    var myChart = new Chart(ctx, {
        type: 'line',
        data: {
            labels: ["M", "T", "W", "T", "F", "S", "S", "M"],
            datasets: [{
                label: 'Traffic',
                data: [0, 50, 100, 150, 200, 250, 300, 350],
                backgroundColor: [
                    'rgba(255, 99, 132, 0.2)',
                    'rgba(54, 162, 235, 0.2)',
                    'rgba(255, 206, 86, 0.2)',
                    'rgba(75, 192, 192, 0.2)',
                    'rgba(153, 102, 255, 0.2)',
                    'rgba(255, 159, 64, 0.2)'
                ],
                borderColor: [
                    'rgba(255,99,132,1)',
                    'rgba(54, 162, 235, 1)',
                    'rgba(255, 206, 86, 1)',
                    'rgba(75, 192, 192, 1)',
                    'rgba(153, 102, 255, 1)',
                    'rgba(255, 159, 64, 1)'
                ],
                borderWidth: 1
            }]
        },
        options: {
            scales: {
                yAxes: [{
                    ticks: {
                        beginAtZero: true
                    }
                }]
            }
        }
    });
</script>

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Hello, We have a website on IIS, Windows server and we are using ASP.NET MVC OutputCache, now we have updated code for few pages, but server is still showing cached pages, so how can I remove cache or clear cache on IIS, without making website go down?

Thanks