C# Signature:

[DllImport("shlwapi.dll", CharSet=CharSet.Auto)]
static extern string PathCombine([Out] StringBuilder lpszDest, string lpszDir, string lpszFile);

VB Signature:

Declare Function PathCombine Lib "shlwapi.dll" (TODO) As TODO

Notes:

This is similar, but not identical, to PathAppend and Path.Combine. For example, combining "C:\foo" with "\bar" yields "C:\bar" rather than "C:\foo\bar" or "\bar" respectively.

Tips & Tricks:

Please add some!

Sample Code:

    [DllImport("shlwapi.dll", CharSet = CharSet.Auto)]
    static extern string PathCombine([Out] StringBuilder lpszDest, string lpszDir, string lpszFile);
    public static string GetAbsolutePath(string basePath, string relativePath)
    {
        StringBuilder sb = new StringBuilder();
        string result = PathCombine(sb,basePath,relativePath);
        return result;
    }

    //nunit test case
    [Test]
    public void TestGetAbsolutePath()
    {
        Assert.AreEqual(@"c:\abc\123.txt",IO.GetAbsolutePath(@"c:\abc\","123.txt"),"Test 1");
        Assert.AreEqual(@"c:\abc\123.txt", IO.GetAbsolutePath(@"c:\abc\efg\", @"..\123.txt"), "Test 1");

    }

Alternative Managed API:

Path.Combine

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