try {  
                OpenFileDialog of = new OpenFileDialog();                 of.ShowDialog();  
                txt_destFilePath.Text = of.FileName;             } catch (Exception ex) {  
                MessageBox.Show(ex.Message);             }  

FolderBrowserDialog fs = new FolderBrowserDialog();             fs.ShowDialog();  
            txt_SourceFilePath.Text = fs.SelectedPath;  

SaveFileDialog sf = new SaveFileDialog();  
             sf.ShowDialog();