ImageGlass.frmMain.RenameImage C# (CSharp) Method

        private void RenameImage()
        {
            try
            {
                if (GlobalSetting.IsImageError || !File.Exists(GlobalSetting.ImageList.GetFileName(GlobalSetting.CurrentIndex)))
                {
                    return;
                }
            }
            catch { return; }

            //Get filename
            string oldName;
            string newName;
            oldName = newName = Path.GetFileName(
                GlobalSetting.ImageList.GetFileName(GlobalSetting.CurrentIndex));
            string currentPath = (Path.GetDirectoryName(
                GlobalSetting.ImageList.GetFileName(GlobalSetting.CurrentIndex)) + "\\")
                .Replace("\\\\", "\\");

            //Get file extension
            string ext = newName.Substring(newName.LastIndexOf("."));
            newName = newName.Substring(0, newName.Length - ext.Length);

            //Show input box
            string str = null;

            if (InputBox.ShowDiaLog(GlobalSetting.LangPack.Items["frmMain._RenameDialogText"], GlobalSetting.LangPack.Items["frmMain._RenameDialog"], newName, false) == DialogResult.OK)
            {
                str = InputBox.Message;
            }

            if (string.IsNullOrWhiteSpace(str))
            {
                return;
            }

            newName = str + ext;

            //duplicated name
            if (oldName == newName)
            {
                return;
            }

            try
            {
                //Rename file
                ImageInfo.RenameFile(currentPath + oldName, currentPath + newName);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }