C# Signature:

[DllImport("advapi32.dll", SetLastError = true)] static extern bool GetUserName(System.Text.StringBuilder sb, ref Int32 length)

VB Signature:

Declare Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" (ByVal lpBuffer As String, ByRef nMax As Integer) As Boolean

User-Defined Types:

None.

Alternative Managed API:

Environment.UserName (System.Environment)

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

using System;
using System.Text;
using System.Runtime.InteropServices;
namespace GetUserNameExample
{
    class Class1
    {
        [DllImport("Advapi32.dll")]
        static extern bool GetUserName(StringBuilder lpBuffer, ref int nSize);    
        [STAThread]
        static void Main(string[] args)
        {
            StringBuilder Buffer = new StringBuilder(64);
            int nSize=64;
            GetUserName(Buffer, ref nSize);
            Console.WriteLine(Buffer.ToString());
        }
    }
}

Sample Code (VB.NET):

Dim xstr as String = Space(255)
Dim max as Integer = 255
Dim rc as Integer

rc = GetUserName(xstr,max)
' max will now contain the total number of
' characters written to the buffer (here: xstr)
MessageBox.Show(Mid(xstr,1,max))