fixed frame code error in java, csharp and python (#2338)

Author: pallavigitwork

examples/dotnet/SeleniumDocs/Interactions/FramesTest.cs

@@ -48,9 +48,9 @@ public void TestFrames()
 
 
             //switch To IFrame using name or id
-            driver.FindElement(By.Name("iframe1-name"));
+            IWebElement iframe1=driver.FindElement(By.Name("iframe1-name"));
             //Switch to the frame
-            driver.SwitchTo().Frame(iframe);
+            driver.SwitchTo().Frame(iframe1);
             Assert.AreEqual(true, driver.PageSource.Contains("We Leave From Here"));
             IWebElement email = driver.FindElement(By.Id("email"));
             //Now we can type text into email field

examples/java/src/test/java/dev/selenium/interactions/FramesTest.java

@@ -48,9 +48,9 @@ public void informationWithElements() {
 
 
          //switch To IFrame using name or id
-         driver.findElement(By.name("iframe1-name"));
+         WebElement iframe1=driver.findElement(By.name("iframe1-name"));
          //Switch to the frame
-         driver.switchTo().frame(iframe);
+         driver.switchTo().frame(iframe1);
          assertEquals(true, driver.getPageSource().contains("We Leave From Here"));
          WebElement email = driver.findElement(By.id("email"));
          //Now we can type text into email field

examples/python/tests/interactions/test_frames.py

@@ -33,7 +33,7 @@
 
 # --- Switch to iframe using name or ID ---
 iframe1=driver.find_element(By.NAME, "iframe1-name")  # (This line doesn't switch, just locates)
-driver.switch_to.frame(iframe)
+driver.switch_to.frame(iframe1)
 assert "We Leave From Here" in driver.page_source
 
 email = driver.find_element(By.ID, "email")