How to perform Drag and Drop operation in Selenium Webdriver?

Step1: Store the path of Source and Target in the  Web-Elements.
          

       WebElement Source = driver.findElement(by.---( ));  
       WebElement Target = driver.findElement(by.---( ));  

Step2: Using the Action class  create an object of it.
          

  Actions builder = new Actions(driver);  

Step3: Perform Drag and Drop operation
         

      Action drag = builder.clickAndHold(Source).moveToElement(Target).release(Target).build( );  
      drag.perform( );