While importing the dxf, instead of choosing the No change, please choose Y Up
how to rotate the model sir to have a proper isometric orientation?
what is the angle of rotation sir ?
The angle of rotation is the amount by which you are trying to rotate the structure about the chosen axis.
I mean what is the amount of angle of rotation should I input to get the isometric view ?
Angle of rotation should be 90 and you should define the axis of rotation to be a line parallel to the global X. You can define the axis by either choosing Node 1, Node 2 or by entering the coordinates of the points. Again as I have already mentioned twice before, you should use the Y-UP option during import rather than trying to rotate the structure.
thank you for helping me sir