FirefoxDriver driver = new FirefoxDriver();
InternetExplorerDriver driver = new InternetExplorerDriver();
ChromeDriver driver = new ChromeDriver();

//Define the interface with the common methods
Interface ISuperDriver
{
void run();
}

//implement the interface on firefox
class FireFoxDriver:ISuperDriver{
void run(){
//firefox driver
}
}

//implement the interface on IE
class InternetExplorerDriver:ISuperDriver{
void run(){
//ie driver
}
}

//chrome
class ChromeDriver:ISuperDriver{
void run(){
//chrome
}
}

//create reference for the interface
ISuperDriver Driver;

if(<input 1>){
 Driver= new FireFoxDriver();}//instantiate firefox
else if(<input 2>){
 Driver= new InternetExplorerDriver();}//IE
else if(<input 3>){
 Driver= new ChromeDriver();}//Chrome

//Finally invoke your method
Driver.Run();

public abstract class Browser {
    public abstract Navigate(string link);
}

public class Firefox : Browser {
    FirefoxDriver driver;
    public Firefox(){
        driver = new FirefoxDriver();
    }

    public abstract Navigate(string link){
        driver.GoTo(link);
    }
}

public class Chrome : Browser {
    ChromeDriver driver;
    public Chrome (){
        driver = new ChromeDriver();
    }

    public abstract Navigate(string link){
        driver.FollowLink(link);
    }
}

public abstract class BrowserDriver { ... }

public class InternetExplorerDriver : BrowserDriver { ... }
public class FirefoxDriver : BrowserDriver { ... }
public class ChromeDriver : BrowserDriver { ... }

BrowserDriver driver = null;

switch (BrowserType) // assuming BrowserType is a property of type Browser enum, holding the value from the set {InternetExplorer, Firefox, Chrome}
{
    case Browser.InternetExplorer:
        driver = new InternetExplorerDriver();
        break;
    case Browser.Firefox:
        driver = new FirefoxDriver();
        break;
    case Browser.Chrome:
        driver = new ChromeDriver();
        break;
}

SomeFunction(driver);

// ...

public void SomeFunction(BrowserDriver driver)
{
    //... your code here
}