c#文件对话框

//文件对话框（选择文件）
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.InitialDirectory = "d:\\";
            ofd.DefaultExt = "*.TXT|*.txt";
            ofd.Filter = "*.TXT|*.txt";
            ofd.Multiselect = false;
            if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                string zdbPath = ofd.FileName;
            }           

//文件夹对话框（选择文件夹）
            FolderBrowserDialog pFolder = new FolderBrowserDialog();
            pFolder.ShowNewFolderButton = false;
            pFolder.Description = "请选择路径：";
            if (pFolder.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                string selectPath = pFolder.SelectedPath;
            }           

//保存文件对话框
            SaveFileDialog saveDG = new SaveFileDialog();
            saveDG.Filter = "Excel文件|*.xls";
            if (saveDG.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                string savePath = saveDG.FileName;
            }           

//判断选择对话框
            if (MessageBox.Show("是否继续执行", "系统提示", MessageBoxButtons.OKCancel) != DialogResult.OK)
            { return; }