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Assigning to array error

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In the below Sub what I have highlighted in red works and I do not get any Compiler error
Code:

Public Sub SaveStreamBuffer(StreamIdx As Integer, StringRecordBuffer As String)
 If (LenB(MidB(PlayWaveBuffer.Stream(StreamIdx).Waves(CurRecPos(StreamIdx)).Data, 1)) < 3) Then
 
  If Len(StringRecordBuffer) > 0 Then
 
  Dim tempArray() As Byte
  ReDim tempArray(Len(StringRecordBuffer))
 
  tempArray = StrConv(StringRecordBuffer, vbFromUnicode)
 
  PlayWaveBuffer.Stream(StreamIdx).Waves(CurRecPos(StreamIdx)).Data = tempArray
     
  IncBufferPointer CurRecPos(StreamIdx)                                       
  End If
 End If                                                                     
End Sub

However, in this Sub I code somewhat the same way but I get a Compiler error: Can't assign to Array
Code:

Private Sub Winsock1_DataArrival(Index As Integer, ByVal BytesTotal As Long)
 Dim WaveData As String
 
 Static ExBytes(MAXTCP) As Long
 Static ExData As String

 If Winsock1(Index).BytesReceived > 0 Then
  Do While Winsock1(Index).BytesReceived > 0
    If ExBytes(Index) = 0 Then
      If waveChunkSize <= Winsock1(Index).BytesReceived Then
        Winsock1(Index).GetData WaveData, vbString, waveChunkSize
                   
        SaveStreamBuffer Index, WaveData
                 
        AddStreamToQueue Index
      Else
        ExBytes(Index) = Winsock1(Index).BytesReceived
        Winsock1(Index).GetData MidB(ExData, Index), vbString, ExBytes(Index)
      End If
    Else
      Winsock1(Index).GetData WaveData, vbByte + vbArray, waveChunkSize - ExBytes(Index)
             
      MidB(ExData, Index) = MidB(Mid(ExData, Index), 1) & MidB(WaveData, 1)
       
      SaveStreamBuffer Index, Mid(ExData, Index)
     
      AddStreamToQueue Index
     
      ExBytes = StrConv(String(MAXTCP, Chr(0)), vbFromUnicode)
     
      ExData = ""                                                                     
    End If
  Loop                                                                                 
       
  If Not Playing And PlayDeviceFree And Not Recording And RecDeviceFree Then
    StartPlayBack         
  End If
 End If
End Sub


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