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    <p>Finally, I got rid of the problem!</p> <p>The real reason of the problem was the encoding string. Here are all the changes I made to improve my code.</p> <p>If you see suspicious things I do that could be improved, feel free to comment</p> <p>my MainApplication:</p> <pre><code>private void processImport() { string[] fields; string field ; string temp = ""; byte[] tempByte; TextFieldParser parser = new TextFieldParser(textbox_csv.Text, System.Text.Encoding.UTF8); parser.TextFieldType = FieldType.Delimited; parser.SetDelimiters(";"); while (!parser.EndOfData) { fields = parser.ReadFields(); field = fields[0]; temp = RemoveDiacritics(field).ToUpper(); //this line is very important. It seems to change the Encoding of my string to Unicode. temp = temp.Normalize(NormalizationForm.FormC); field = myVbDll.MyWrappedFunction(temp, false); } parser.Close(); } //Transforms the culture of a letter to its equivalent representation in the 0-127 ascii table, such as the letter 'é' is substituted by an 'e' public string RemoveDiacritics(string s) { string normalizedString = null; StringBuilder stringBuilder = new StringBuilder(); normalizedString = s.Normalize(NormalizationForm.FormD); int i = 0; char c = '\0'; for (i = 0; i &lt;= normalizedString.Length - 1; i++) { c = normalizedString[i]; if (CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark) { stringBuilder.Append(c); } } return stringBuilder.ToString().ToLower(); } </code></pre> <p>Part of VB.net Dll, called by my c# program :</p> <pre><code>Public Class myVbDll &lt;DllImport("Wrapper.dll", CharSet:=CharSet.Unicode)&gt; Public Shared Function MyWrappedFunction (ByVal nom As String, ByVal opt As Boolean) As String End Function End Class </code></pre> <p>part of C++ wrapper, called by VB.net Dll :</p> <pre><code>typedef void (*MYFUNCTION)(CString&amp;, CString&amp;, BYTE); MYFUNCTION Myfunction; LPWSTR _stdcall MyWrappedFunction(LPWSTR ValInput, BYTE opt) { HINSTANCE gLibtestDLL=NULL; CString S_ValInput(ValInput); CString S_resultat; gLibtestDLL = AfxLoadLibrary(TEXT(".\\test.dll")); if(gLibtestDLL == NULL) { MessageBox(NULL, TEXT("unable to load test.DLL"), TEXT("Error"),MB_OK | MB_ICONINFORMATION); return NULL; } Myfunction = (MYFUNCTION)GetProcAddress(gLibtestDLL, "Myfunction"); if (Myfunction == NULL) { MessageBox(NULL, TEXT("Can't find Myfunction."), TEXT("Error"),MB_OK | MB_ICONINFORMATION); return NULL; } //****************************************************************** S_resultat.Format("%64c", ' '); Myfunction(S_ValInput , S_resultat , opt); //Run MFC function S_resultat.TrimRight(); S_resultat.ReleaseBuffer(); char* tmp = (char*) CoTaskMemAlloc((S_resultat.GetLength()*2)+1); memset(tmp,0,sizeof(tmp)); strcpy_s(tmp, (S_resultat.GetLength()+1), S_resultat.GetBuffer(S_resultat.GetLength())); S_resultat.ReleaseBuffer(); wchar_t wtext[1024]; memset(wtext,0,sizeof(wtext)); mbstowcs(wtext, tmp, strlen(tmp)+1);//Plus \0 LPWSTR resultat = wtext; AfxFreeLibrary(gLibtestDLL); return resultat; } </code></pre>
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