If you need to toggle between using Tabs or spaces in your Visual Studio projects and files, you can use this simple Macro from within VS to toggle between tabs vs. no tabs:

  1. Open the Macro Editor via Tools -> Macros -> Macros IDE (Alt+F11)
  2. Paste in the following VBA code:
1 Public Sub ToggleTabs()
2     Dim currentSetting As Boolean = DTE.Properties("TextEditor", "CSharp").Item("InsertTabs").Value
3     DTE.Properties("TextEditor", "CSharp").Item("InsertTabs").Value = Not currentSetting    
4 End Sub
  1. Open the Macro Editor via Tools -> Macros -> Macro Explorer (Alt+F8)
  2. Run the “ToggleTabs” macro

For more information on other settings that can be utilized via macros, see the MSDN page

Or, see how one can use Settings files to achieve the same goal, but I think the Macro is a little easier / faster to switch between them.

EDIT: Here is a more complete script that I use that will toggle the tabs of C#, SQL, HTML, and javascript, but only when you are editing a file of that language’s:

 1 Public Sub ToggleTabs()
 2   If DTE.ActiveDocument.Language = "CSharp" Then
 3       Dim currentSetting As Boolean = DTE.Properties("TextEditor", "CSharp").Item("InsertTabs").Value
 4       DTE.Properties("TextEditor", "CSharp").Item("InsertTabs").Value = Not currentSetting
 5   End If
 6 
 7   If DTE.ActiveDocument.Language = "SQL" Then
 8       Dim currentSQLSetting As Boolean = DTE.Properties("TextEditor", "SQL").Item("InsertTabs").Value
 9       DTE.Properties("TextEditor", "SQL").Item("InsertTabs").Value = Not currentSQLSetting
10   End If
11 
12   If DTE.ActiveDocument.Language = "HTML" Then
13       Dim currentHTMLSetting As Boolean = DTE.Properties("TextEditor", "HTML").Item("InsertTabs").Value
14       DTE.Properties("TextEditor", "HTML").Item("InsertTabs").Value = Not currentHTMLSetting
15   End If
16 
17   If DTE.ActiveDocument.Language = "JScript" Then
18       Dim currentJScriptSetting As Boolean = DTE.Properties("TextEditor", "JScript").Item("InsertTabs").Value
19       DTE.Properties("TextEditor", "JScript").Item("InsertTabs").Value = Not currentJScriptSetting
20   End If
21   
22 End Sub