通過進度條（Windows窗體）上的savefiledialog顯示保存進度？

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我需要使用窗體中的「SaveFileDialog」和「Progress Bar」來顯示保存文件的進度。正在保存的文件是文本文件（rtf，txt，...）。這是我用它來保存文件：通過進度條（Windows窗體）上的savefiledialog顯示保存進度？

private void Save() 
    { 
     if (TabControl.TabPages.Count != 0) 
     { 
      SaveFileDialog.FileName = TabControl.SelectedTab.Name; 
      SaveFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments); //default path 
      SaveFileDialog.Filter = "Rich Text Format|*.rtf";//Extensions 
      SaveFileDialog.Title = "Save"; 

      if (SaveFileDialog.ShowDialog() == DialogResult.OK) 
      { 
       if (SaveFileDialog.FileName.Length > 0) 
       { 
        GetCurrentDocument.SaveFile(SaveFileDialog.FileName, RichTextBoxStreamType.RichText);//Stream Type for .rtf 
       } 
      } 
      else if (SaveFileDialog.ShowDialog() == DialogResult.Cancel) 
      { 
       StatusBar.Text = "Saving Cancelled."; //Makes sure it doesn't crash on cancel 
      } 
     } 
     else 
     { 
      StatusBar.Text = "Can't save. No tabs are detected."; 
     } 
    }

的GetCurrentDocument是這樣的：

private RichTextBox GetCurrentDocument 
    { 
     get 
     { 
      return 
       (RichTextBox)TabControl.SelectedTab.Controls["Body"]; 
     } 
    }

因此，SAVEFILE（）是：