pinvoke.net: Edit: kernel32.GetTempPath

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Summary: Retrieves the path of the directory designated for temporary files.

!!!!C# Signature:
 [DllImport("kernel32.dll")]
 static extern uint GetTempPath(uint nBufferLength,
   [Out] StringBuilder lpBuffer);
!!!!VB Signature:
 Declare Function GetTempPath Lib "kernel32.dll" (nBufferLength As Integer, _
   <Out> lpBuffer As StringBuilder) As Integer
!!!!Notes:
None.

!!!!Tips & Tricks:
Note that there are two entrypoints to GetTempPath in kernel32.dll called "GetTempPathA" and "GetTempPathW". So if you want to use GetTempPath you have to set the EntryPoint on the DllImport-Attribute as follows (C#):
[DllImport("kernel32.dll", EntryPoint = "GetTempPathA")]

Please add some more!

!!!!Sample Code:
'''VB Sample'''
 'TempFile.vb
 '(DllImport declarations omitted)
 Public Class TempFile
     Public Const MAX_PATH As Integer = 260

Public Function Create(ByVal astrFoldername As String, _
                            ByVal astrPrefix As String) As String
         Dim tempPath As New StringBuilder(MAX_PATH - 14)
         Dim tempName As New StringBuilder(MAX_PATH)
         Dim lngRet As Integer
         Dim result As String = ""

lngRet = 1

If (astrFoldername = "") Then
             lngRet = GetTempPath(MAX_PATH - 14, tempPath)
             astrFoldername = tempPath.ToString
         End If

If (lngRet > 0 And lngRet <= MAX_PATH - 14) Then
             lngRet = GetTempFileName(astrFoldername, astrPrefix, 0, tempName)
             If lngRet <> 0 Then
                 result = tempName.ToString
             End If
         End If

Return result
   End Function

End Class

'This project references Microsoft.VisualStudio.QualityTools.UnitTestFramework
 'TempFileTest.vb
 Imports System.IO
 Imports System.Text

Imports Microsoft.VisualStudio.TestTools.UnitTesting

'''<summary>
 '''This is a test class for TempFileTest and is intended
 '''to contain all TempFileTest Unit Tests
 '''</summary>
 <TestClass()> _
 Public Class TempFileTest
    Private fFoldername As String = "C:\TempFile"
    Private fPrefix As String = "Prefix"  ' Only first three characters will be used by Windows API
    Private testContextInstance As TestContext

'''<summary>
    '''Gets or sets the test context which provides
    '''information about and functionality for the current test run.
    '''</summary>
    Public Property TestContext() As TestContext
        Get
            Return testContextInstance
        End Get
        Set(ByVal value As TestContext)
            testContextInstance = value
        End Set
    End Property

'''<summary>
    '''A test for Create
    '''</summary>
    <TestMethod()> _
    Public Sub CreateTest()
        Dim target As TempFile = New TempFile
        Dim expected As String = fFoldername + "\" + Left(fPrefix, 3)  'Only part of the expected answer. The other part is random.
        Dim actual As String
        Dim dirInfo As DirectoryInfo

If Not Directory.Exists(fFoldername) Then
            dirInfo = Directory.CreateDirectory(fFoldername)
            If Not dirInfo.Exists Then
                Throw New Exception("Directory '" + fFoldername + "' can not be created")
            End If
        End If

actual = target.Create(fFoldername, fPrefix)
        Assert.IsTrue(File.Exists(actual))
        'Remove file before procedure exits.
        File.Delete(actual)
        Assert.AreEqual(Left(expected, Len(fFoldername) + 4), Left(actual, Len(fFoldername) + 4))

Dim shortPath As New StringBuilder(TempFile.MAX_PATH)
        TempFile.GetShortPathName(Path.GetTempPath, shortPath, TempFile.MAX_PATH)
        expected = shortPath.ToString + Left(fPrefix, 3) ' GetTempPath end with "\"
        actual = target.Create("", fPrefix)
        Assert.IsTrue(File.Exists(actual))
        'Remove file before procedure exits.
        File.Delete(actual)
        Assert.AreEqual(Left(expected, Len(fFoldername) + 4), Left(actual, Len(fFoldername) + 4))
    End Sub
 End Class

!!!!Alternative Managed API:
System.IO.Path.GetTempPath@msdn

Documentation: GetTempPath@msdn on MSDN