geckodriver.exe not in current directory or path variable, Selenium 2.53.1 + Firefox 48 + Selenium 3 Beta

Try to put the geckodriver.exe in your path: C:\Users\YourName\Documents\Visual Studio 2013\Projects\seleniump\seleniump\bin\Debug

you can find geckodriver.exe at this link:

https://github.com/mozilla/geckodriver/releases

Install the Selenium.Firefox.Webdriver NuGet package.

This will copy geckodriver.exe to the bin folder.

This solution may helps you fix problem: ( It did help me though)

public class TestResult {

    private IWebDriver driver;
    private StringBuilder verificationErrors;
    private string baseURL;
    private bool acceptNextAlert = true;

    [TestInitialize]
    public void SetupTest() {
        FirefoxDriverService service = FirefoxDriverService.CreateDefaultService(@"C:\geckodriver", "geckodriver.exe");
        service.Port = 64444;
        service.FirefoxBinaryPath = @"C:\Program Files (x86)\Firefox Developer Edition\firefox.exe";
        driver = new FirefoxDriver(service);
        baseURL = "http://localhost:49539";
        verificationErrors = new StringBuilder();
    }
}

REFERENCE

• Check out @juver-malpartida 's Answer