pinvoke.net: Edit: shlwapi.PathIsRelative

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Summary: Returns TRUE if the path is relative, or FALSE if it is absolute.

!!!!C# Signature:
 [DllImport("shlwapi.dll", CharSet = CharSet.Auto)]
 static extern bool PathIsRelative([In] string lpszPath);
!!!!VB.NET Signature
 ''' <summary>
 ''' Searches a path and determines if it is relative.
 ''' </summary>
 ''' <param name="pszPath">A pointer to a null-terminated string of maximum length MAX_PATH that contains the path to search.</param>
 ''' <returns>Returns TRUE if the path is relative, or FALSE if it is absolute.</returns>
 <DllImport("shlwapi.dll", EntryPoint:="PathIsRelativeW",  SetLastError:=True, CharSet:=CharSet.Unicode)> _
 Public Function PathIsRelative(<MarshalAs(UnmanagedType.LPTStr)>pszPath As String) As <MarshalAs(UnmanagedType.Bool)> Boolean
 End Function
!!!!VB Signature:
 'THIS IS UNTESTED!!!
 Private Declare Function PathIsRelative Lib "shlwapi" _
      Alias "PathIsRelativeA" (ByVal pszPath As String) As Long

!!!!User-Defined Types:
None.

!!!!Alternative Managed API:
 The '''Path.IsPathRooted''' function works the same, but the return value is opposite.  
 It returns '''true''' for an absolute path, and '''false''' for a relative path.

!!!!Notes:
None.

!!!!Tips & Tricks:
None

!!!!Sample Code:
!!!!!C# Example
        [DllImport("shlwapi.dll", CharSet = CharSet.Auto)] static extern bool PathIsRelative([In] string lpszPath);
        public static bool IsRelativePath(string path)
        {
            return PathIsRelative(path);
	}

//nunit test
        [Test]
        public void TestIsRelative()
        {
            Assert.AreEqual(true,IO.IsRelativePath(@"test.txt"),"Test 1");
            Assert.AreEqual(true, IO.IsRelativePath(@"..\test.txt"), "Test 2");
            Assert.AreEqual(true, IO.IsRelativePath(@"..\..\test.txt"), "Test 3");
            Assert.AreEqual(false, IO.IsRelativePath(@"C:\test.txt"), "Test 4");
        }

!!!!!VB.NET Example
 <DllImport("shlwapi.dll", EntryPoint:="PathIsRelativeW",  SetLastError:=True, CharSet:=CharSet.Unicode)> _
 Public Function PathIsRelative(<MarshalAs(UnmanagedType.LPTStr)>pszPath As String) As <MarshalAs(UnmanagedType.Bool)> Boolean
 End Function

Public Shared Function IsRelativePath(path As String) As Boolean
    Return PathIsRelative(path)
 End  Function

'nunit test
 <Test> _
 Public Sub TestIsRelative()
      Assert.AreEqual(true,IsRelativePath("test.txt"),"Test 1")
      Assert.AreEqual(true, IsRelativePath("..\test.txt"), "Test 2")
      Assert.AreEqual(true, IsRelativePath("..\..\test.txt"), "Test 3")
      Assert.AreEqual(false, IsRelativePath("C:\test.txt"), "Test 4")
 End Sub

Documentation: PathIsRelative@msdn on MSDN