I am trying to read a file located at \"C:\\Users\\Siddharth\\Documents\\aarti\\yeh_vidhi_mangal.txt\". Following code indicates that file exists
String filename
Try using single slash rather than double slash like
C:/User/Documents/your Filename.
and use Backward Slash Because your File is going to inherit in the following Directories so write the path like this for ex:
C:\User\Documents\Your Filename.