在图片框的列表框中显示与所选项目同名的图像

So im doing a program that the users will be able to add tv shows and they could download images and assign it themselves from within the program. I have a listbox called lstShows and a picturebox called picbox, the problem i have is I don't know how to make the selected item in lstShows to search the directory in Documents for the picture with the same name as the item and then display it in the PicBox. so for example, the user adds Game of Thrones to the lstshows, and then downloads an image for it called "Game of Thrones.jpeg" i wan the lstshows selected item to search for that name and display it under the selected item name, which will be "Game of Thrones". So im doing a program that the users will be ab