Is it possible to see file changes with previous version using Winmerge before commit?
Thank you.
Of course.
Right click on a folder or file under version control, and choose Tortoise SVN->Settings from the pop-up menu.
Navigate to the External Programs->Diff Viewer item in the treeview on the left. Check the radio button for External in the Configure the program used for comparing different revisions of files at the top, and put in the information for WinMerge. See the TortoiseSVN Help file (click the Help button at the bottom right of the mentioned dialog) for command-line options (including the exact ones needed for WinMerge).