Chinese garbled problem in asp.net

The default encoding of asp.net is utf-8. When there is Chinese in the string that is processed interactively with other platforms, garbled characters often appear. This is because other platforms have many Adopt GB2312 encoding. To solve this problem, you can write a function to convert the string first and then process it. The following is the source code of the function:

Imports System.Math
Function URLEncoding(ByVal vstrIn As String)
   Dim strReturn As String
   strReturn = ""
   Dim i As Integer
   Dim ThisChr As String
   Dim innerCode, Hight8, Low8 As Integer
   For i = 1 To vstrIn.Length
       ThisChr = Mid(vstrIn, i, 1)
          If Abs(Asc(ThisChr)) < &HFF Then
                strReturn = strReturn & ThisChr
          Else
                 innerCode = Asc(ThisChr)
           If innerCode < 0 Then
                innerCode = innerCode + &H10000
           End If
           Hight8 = (innerCode And &HFF00) / &HFF
           Low8 = innerCode And &HFF
           strReturn = strReturn & "%" & Hex(Hight8) & "%" & Hex(Low8)
      End If
 Next
 URLEncoding = strReturn
End Function

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