Switching between multiple frames in selenium

There can be multiple iframes in a webPage. To perform action on webelements in a frame, we need to first identify the frame and then perform action on the element.We can switch to a particular frame based on the below identifiers:

By Index: The index depends on the order of frame in the Page. A numeric value is assigned to the frame based on the order in which it appears in the page.

driver.SwitchTo().Frame(0);

By Name: We can switch to a frame based on the name of the frame.

driver.SwitchTo().Frame("FrameName");

By Id: We can switch to a frame based on the id defined for the frame

driver.SwitchTo().Frame("FrameId");

Switch to a frame by locator for WebElement. In the below example frameElement is the locator for the frame

driver.switchTo().frame(frameElement);

e.g: 

driver.SwitchTo().Frame(driver.FindElement(By.CssSelector(cssfortheelement)));

Frame inside frames: There can be scenario in which there are frame inside of the parent frame.Please note in case of frame inside frame, we need to first switch to the outer frame, and then switch to the inner frame to perform action on the webelement.

To acess the main webPage and come out of the frame, below code is used

driver.SwitchTo().DefaultContent()