ASP.NET 5 MVC: unable to connect to web server ‘IIS Express’

What I’m doing: Opening Visual Studio Community 2015 File -> New -> Project Under Visual C#: Web -> ASP.NET Web Application Web Application And press f5 for the popup error “unable to connect to web server ‘IIS Express’.“ Deleting applicationhost.config, located in Documents\IISExpress\config, doesn’t change the error message. (There’s also an IISExpress folder in program files and program files (x86).) Something I … Read more

C# Java HashMap equivalent

Dictionary is probably the closest. System.Collections.Generic.Dictionary implements the System.Collections.Generic.IDictionary interface (which is similar to Java’s Map interface). Some notable differences that you should be aware of: Adding/Getting items Java’s HashMap has the put and get methods for setting/getting items myMap.put(key, value) MyObject value = myMap.get(key) C#’s Dictionary uses [] indexing for setting/getting items myDictionary[key] = value MyObject value = myDictionary[key] null keys Java’s HashMap allows null keys .NET’s Dictionary throws an ArgumentNullException if you try … Read more

Input string was not in a correct format

The error means that the string you’re trying to parse an integer from doesn’t actually contain a valid integer. It’s extremely unlikely that the text boxes will contain a valid integer immediately when the form is created – which is where you’re getting the integer values. It would make much more sense to update a and b in the … Read more