C#

wchar_t buf[2323];

wchar_t *pBuf;

ULONG numLangs;

ULONG size= 2323;



GetThreadPreferredUILanguages(MUI_MERGE_USER_FALLBACK, &numLangs, buf, &

[DllImport("Kernel32.dll", CharSet = CharSet.Auto)]

       static extern System.Boolean GetThreadPreferredUILanguages(

           System.UInt32 dwFlags,

           ref System.UInt32 pulNumLanguages,

           out System.IntPtr pwszLanguagesBuffer,

           ref System.UInt32 pcchLanguagesBuffer

           );





         uint MUI_MERGE_USER_FALLBACK = 0x20;

           uint numLang = 0;

           IntPtr pwszLangBuf = new IntPtr();

           uint langBuf = 2323;

           bool b = GetThreadPreferredUILanguages(MUI_MERGE_USER_FALLBACK, ref numLang, out pwszLangBuf, ref langBuf);



           string tmp = Marshal.PtrToStringAuto(pwszLangBuf

//Class 1:
public void ProcessPerson(Request arg)
{
    try
    {
        if(Class2.ValidateUser(arg.Username, arg.Role)
        {
            //Do something
        }
        else
        {
            //log error
        }
    }
    catch(ArgumentNullException ex)
    {
        //log error
    }
    catch(Exception ex)
    {
        //log error
    }
}

//Class 2:
public static bool ValidateUser(string Username, string Role)
{
    try
    {
        using(MyClass myClass = new MyClass())
        {
            if(myClass.GetAdmin(Username, Role)
                return true;
            else
                return false;
        }
    }
    catch
    {
        throw;
    }
}

// MyClass
public bool GetAdmin(string Username, string Role)
{
    // should I do this?
    if(String.IsNullOrWhitespace(Username) || String.IsNullOrWhitespace(Role))
    {
        throw new ArgumentNullException("e.g. Username or Role cannot be null");
    }
    
    try
    {
        using(MyClassAdapter myClassAdapter = new MyClassAdapter ())
        {
            myClassAdapter.GetAdmin(Username, Role); 
        }
    }
    catch(ArgumentNullException ex)
    {
        throw;
    }
    catch(Exception ex)
    {
        throw;
    }
}