title: Best way to handle huge strings in C#
body: <p>I have to write the data below to a textfile after replacing two values with ##IP##, ##PORT##.
  What is the best way? Should I hold all in a string and use Replace and write to textfile?</p>
  
  <p>Data:</p>
  
  <pre><code>[APP]
      iVersion=   101
      pcVersion=  1.01a
      pcBuildDate=Mar 27 2009
  [MAIN]
      iFirstSetup=        0
      rcMain.rcLeft=    676
      rcMain.rcTop=     378
      rcMain.rcRight=  1004
      rcMain.rcBottom=  672
      iShowLog=           0
      iMode=              1
  [GENERAL]
      iTips=              1
      iTrayAnimation=     1
      iCheckColor=        1
      iPriority=          1
      iSsememcpy=         1
      iAutoOpenRecv=      1
      pcRecvPath=         C:\Documents and Settings\karthikeyan\My Documents\Downloads\fremote101a\FantasyRemote101a\recv
      pcFileName=         FantasyRemote
      iLanguage=          1
  [SERVER]
      iAcceptVideo=       1
      iAcceptAudio=       1
      iAcceptInput=       1
      iAutoAccept=        1
      iAutoTray=          0
      iConnectSound=      1
      iEnablePassword=    0
      pcPassword=
      pcPort=          7902
  [CLIENT]
      iAutoConnect=       0
      pcPassword=
      pcDefaultPort=   7902
  [NETWORK]
      pcConnectAddr=##IP##
      pcPort=##Port##
  [VIDEO]
      iEnable=                  1
      pcFcc=                 AMV3
      pcFccServer=           
      pcDiscription=         
      pcDiscriptionServer=   
      iFps=                    30
      iMouse=                   2
      iHalfsize=                0
      iCapturblt=               0
      iShared=                  0
      iSharedTime=              5
      iVsync=                   1
      iCodecSendState=          1
      iCompress=                2
      pcPlugin=              
      iPluginScan=              0
      iPluginAspectW=          16
      iPluginAspectH=           9
      iPluginMouse=             1
      iActiveClient=            0
      iDesktop1=                1
      iDesktop2=                2
      iDesktop3=                0
      iDesktop4=                3
      iScan=                    1
      iFixW=                   16
      iFixH=                    8
  [AUDIO]
      iEnable=                  1
      iFps=                    30
      iVolume=                  6
      iRecDevice=               0
      iPlayDevice=              0
      pcSamplesPerSec=    44100Hz
      pcChannels=      2ch:Stereo
      pcBitsPerSample=      16bit
      iRecBuffNum=            150
      iPlayBuffNum=             4
  [INPUT]
      iEnable=                  1
      iFps=                    30
      iMoe=                     0
      iAtlTab=                  1
  [MENU]
      iAlwaysOnTop=             0
      iWindowMode=              0
      iFrameSize=               4
      iSnap=                    1
  [HOTKEY]
      iEnable=                            1
      key_IDM_HELP=              0x00000070
      mod_IDM_HELP=              0x00000000
      key_IDM_ALWAYSONTOP=       0x00000071
      mod_IDM_ALWAYSONTOP=       0x00000000
      key_IDM_CONNECT=           0x00000072
      mod_IDM_CONNECT=           0x00000000
      key_IDM_DISCONNECT=        0x00000073
      mod_IDM_DISCONNECT=        0x00000000
      key_IDM_CONFIG=            0x00000000
      mod_IDM_CONFIG=            0x00000000
      key_IDM_CODEC_SELECT=      0x00000000
      mod_IDM_CODEC_SELECT=      0x00000000
      key_IDM_CODEC_CONFIG=      0x00000000
      mod_IDM_CODEC_CONFIG=      0x00000000
      key_IDM_SIZE_50=           0x00000074
      mod_IDM_SIZE_50=           0x00000000
      key_IDM_SIZE_100=          0x00000075
      mod_IDM_SIZE_100=          0x00000000
      key_IDM_SIZE_200=          0x00000076
      mod_IDM_SIZE_200=          0x00000000
      key_IDM_SIZE_300=          0x00000000
      mod_IDM_SIZE_300=          0x00000000
      key_IDM_SIZE_400=          0x00000000
      mod_IDM_SIZE_400=          0x00000000
      key_IDM_CAPTUREWINDOW=     0x00000077
      mod_IDM_CAPTUREWINDOW=     0x00000004
      key_IDM_REGION=            0x00000077
      mod_IDM_REGION=            0x00000000
      key_IDM_DESKTOP1=          0x00000078
      mod_IDM_DESKTOP1=          0x00000000
      key_IDM_ACTIVE_MENU=       0x00000079
      mod_IDM_ACTIVE_MENU=       0x00000000
      key_IDM_PLUGIN=            0x0000007A
      mod_IDM_PLUGIN=            0x00000000
      key_IDM_PLUGIN_SCAN=       0x00000000
      mod_IDM_PLUGIN_SCAN=       0x00000000
      key_IDM_DESKTOP2=          0x00000078
      mod_IDM_DESKTOP2=          0x00000004
      key_IDM_DESKTOP3=          0x00000079
      mod_IDM_DESKTOP3=          0x00000004
      key_IDM_DESKTOP4=          0x0000007A
      mod_IDM_DESKTOP4=          0x00000004
      key_IDM_WINDOW_NORMAL=     0x0000000D
      mod_IDM_WINDOW_NORMAL=     0x00000004
      key_IDM_WINDOW_NOFRAME=    0x0000000D
      mod_IDM_WINDOW_NOFRAME=    0x00000002
      key_IDM_WINDOW_FULLSCREEN= 0x0000000D
      mod_IDM_WINDOW_FULLSCREEN= 0x00000001
      key_IDM_MINIMIZE=          0x00000000
      mod_IDM_MINIMIZE=          0x00000000
      key_IDM_MAXIMIZE=          0x00000000
      mod_IDM_MAXIMIZE=          0x00000000
      key_IDM_REC_START=         0x00000000
      mod_IDM_REC_START=         0x00000000
      key_IDM_REC_STOP=          0x00000000
      mod_IDM_REC_STOP=          0x00000000
      key_IDM_SCREENSHOT=        0x0000002C
      mod_IDM_SCREENSHOT=        0x00000002
      key_IDM_AUDIO_MUTE=        0x00000073
      mod_IDM_AUDIO_MUTE=        0x00000004
      key_IDM_AUDIO_VOLUME_DOWN= 0x00000074
      mod_IDM_AUDIO_VOLUME_DOWN= 0x00000004
      key_IDM_AUDIO_VOLUME_UP=   0x00000075
      mod_IDM_AUDIO_VOLUME_UP=   0x00000004
      key_IDM_CTRLALTDEL=        0x00000023
      mod_IDM_CTRLALTDEL=        0x00000003
      key_IDM_QUIT=              0x00000000
      mod_IDM_QUIT=              0x00000000
      key_IDM_MENU=              0x0000007B
      mod_IDM_MENU=              0x00000000
  [OVERLAY]
      iIndicator=            1
      iAlphaBlt=             1
      iEnterHide=            0
      pcFont=     MS UI Gothic
  [AVI]
      iSound=                    1
      iFileSizeLimit=       100000
      iPool=                     4
      iBuffSize=                32
      iStartDiskSpaceCheck=      1
      iStartDiskSpace=        1000
      iRecDiskSpaceCheck=        1
      iRecDiskSpace=           100
      iCache=                    0
      iAutoOpen=                 1
      pcPath=C:\Documents and Settings\karthikeyan\My Documents\Downloads\fremote101a\FantasyRemote101a\avi
  [SCREENSHOT]
      iSound=       1
      iAutoOpen=    1
      pcPath=       C:\Documents and Settings\karthikeyan\My Documents\Downloads\fremote101a\FantasyRemote101a\ss
      pcPlugin=   BMP
  [CDLG_SERVER]
      mrcWnd.rcLeft=      667
      mrcWnd.rcTop=       415
      mrcWnd.rcRight=    1013
      mrcWnd.rcBottom=    634
  [CWND_CLIENT]
      miShowLog=            0
      m_iOverlayLock=       0
  [CDLG_CONFIG]
      mrcWnd.rcLeft=      467
      mrcWnd.rcTop=       247
      mrcWnd.rcRight=    1213
      mrcWnd.rcBottom=    802
      miTabConfigSel=       2
  </code></pre>