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static extern bool PathIsRelative([In] string lpszPath);

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<DllImport("shlwapi.dll", EntryPoint:="PathIsRelativeW",  SetLastError:=True, CharSet:=CharSet.Unicode)> _

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Public Function PathIsRelative(<MarshalAs(UnmanagedType.LPTStr)>pszPath As String) As <MarshalAs(UnmanagedType.Bool)> Boolean

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Private Declare Function PathIsRelative Lib "shlwapi" _

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      Alias "PathIsRelativeA" (ByVal pszPath As String) As Long

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    [DllImport("shlwapi.dll", CharSet = CharSet.Auto)] static extern bool PathIsRelative([In] string lpszPath);

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        return PathIsRelative(path);

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<DllImport("shlwapi.dll", EntryPoint:="PathIsRelativeW",  SetLastError:=True, CharSet:=CharSet.Unicode)> _

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Public Function PathIsRelative(<MarshalAs(UnmanagedType.LPTStr)>pszPath As String) As <MarshalAs(UnmanagedType.Bool)> Boolean

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    Return PathIsRelative(path)

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Documentation

[PathIsRelative] on MSDN