I have a c# code.(which is exported from selenium IDE)
using System;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
usin
It seems like you have references missing. From official Selenium docs page:
Add references to the following DLLs: nmock.dll, nunit.core.dll, nunit. framework.dll, ThoughtWorks.Selenium.Core.dll, ThoughtWorks.Selenium.IntegrationTests.dll and ThoughtWorks.Selenium.UnitTests.dll
For your current problem, you need to reference at least NUnit.Framework.dll and Selenium dlls.
Please read the docs page for more info.