The type or namespace SelectElement could not be found in selenium c#

Referring to a few previous posts it seems if you are using frameworks like nunittestadapter, NUnit.Framework, VS 2017 using the NuGet Manager sometimes there can be issues with the installation /configuration.

SelectElement Class

As per the documentation the SelectElement Class is pretty much available within OpenQA.Selenium.Support.UI Namespace which provides a convenience method for manipulating selections of options in an HTML select element.

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Inheritance Hierarchy

System.Object
    OpenQA.Selenium.Support.UI.SelectElement

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Namespace: OpenQA.Selenium.Support.UI

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Assembly: WebDriver.Support (in WebDriver.Support.dll) Version: 3.1.0

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Syntax: public class SelectElement : IWrapsElement

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Snapshot:

Solution

Uninstall & reinstall the Selenium.Webdriver and Selenium.Support packages, that will surely fix the problem.

Reference

You can find a relevant discussion in Cannot find WebDriverWait class in OpenQa Selenium 3.7

You need to make sure to reference the NuGet Package Selenium.Support.

I was having the same issue and then realized that I was only referencing the Selenium.WebDriver NuGet Package. After adding the Selenium.Support NuGet package, and adding the proper using statements. My SelectElement code successfully compiled.

The proper using statements

using OpenQA.Selenium;
using OpenQA.Selenium.Support.UI;

I had the same issue due to using the pre-release version. v4.00 alpha. I installed the previous version v3.141.0 and the errors were resolved