Visual Studio 2010 macros to set "Insert spaces" or "Keep tabs" in Tools -> Options -> Text Editor -> C# -> Tabs page. Thanks to answer http://stackoverflow.com/a/1721896/2492669. For those who switching between solutions with spaces and tabs. As for me, I have assigned macros on ctrl+shift+alt+s and ctrl+shift+alt+t and quite happy now.

InsertTabsOrSpaces-vc2010macro.vb

Option Strict Off
Option Explicit Off
Imports System
Imports EnvDTE
Imports EnvDTE80
Imports EnvDTE90
Imports EnvDTE90a
Imports EnvDTE100
Imports System.Diagnostics

Public Module InsertTabsOrSpaces
    Sub InsertTabs()
        DTE.Properties("TextEditor", "CSharp").Item("InsertTabs").Value = True
    End Sub

    Sub InsertSpaces()
        DTE.Properties("TextEditor", "CSharp").Item("InsertTabs").Value = False
    End Sub

    'For Debugging..
    Sub ShowAvailableProperties()
        Dim prop As EnvDTE.Property
        Dim props As EnvDTE.Properties
        props = DTE.Properties("TextEditor", "CSharp")
        Try
            ' List each property name for the Options page
            ' and all of its possible values.
            For Each prop In props
                msg += "PROP NAME: " & prop.Name & vbCr
            Next
            MsgBox(msg)
        Catch ex As System.Exception
            MsgBox("ERROR: " & ex.Message)
        End Try
    End Sub
End Module