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    <p>This question got some great, highly voted answers!</p> <p>Ryan Cook's answer is close to what I'm after and may be more appropriate for other developers. However, it adds http:// to the beginning of the string and in general it does a bit more formatting than I'm after. </p> <p>Also, for my use cases, resolving relative paths is not important. </p> <p>mdsharp's answer also contains the seed of a good idea, although that actual implementation needed a few more details to be complete. This is an attempt to flesh it out (and I'm using this in production):</p> <p><strong>C#</strong></p> <pre><code>public string UrlCombine(string url1, string url2) { if (url1.Length == 0) { return url2; } if (url2.Length == 0) { return url1; } url1 = url1.TrimEnd('/', '\\'); url2 = url2.TrimStart('/', '\\'); return string.Format("{0}/{1}", url1, url2); } </code></pre> <p><strong>VB.Net</strong></p> <pre class="lang-vb prettyprint-override"><code>Public Function UrlCombine(ByVal url1 As String, ByVal url2 As String) As String If url1.Length = 0 Then Return url2 End If If url2.Length = 0 Then Return url1 End If url1 = url1.TrimEnd("/"c, "\"c) url2 = url2.TrimStart("/"c, "\"c) Return String.Format("{0}/{1}", url1, url2) End Function </code></pre> <p>This code passes the following test, which happens to be in VB:</p> <pre class="lang-vb prettyprint-override"><code>&lt;TestMethod()&gt; Public Sub UrlCombineTest() Dim target As StringHelpers = New StringHelpers() Assert.IsTrue(target.UrlCombine("test1", "test2") = "test1/test2") Assert.IsTrue(target.UrlCombine("test1/", "test2") = "test1/test2") Assert.IsTrue(target.UrlCombine("test1", "/test2") = "test1/test2") Assert.IsTrue(target.UrlCombine("test1/", "/test2") = "test1/test2") Assert.IsTrue(target.UrlCombine("/test1/", "/test2/") = "/test1/test2/") Assert.IsTrue(target.UrlCombine("", "/test2/") = "/test2/") Assert.IsTrue(target.UrlCombine("/test1/", "") = "/test1/") End Sub </code></pre>
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    1. COTalking of details: what about the mandatory `ArgumentNullException("url1")` if the argument is `Nothing`? Sorry, just being picky ;-). Note that a backslash has nothing to do in a URI (and if it is there, it should not be trimmed), so you can remove that from your TrimXXX.
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    2. COyou can use params string[] and recursively join them to allow more than 2 combinations
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    3. COIt's a good solution but it doesn't address following cases: `Assert.IsTrue(target.UrlCombine("../test1", "/") = "../test1/") Assert.IsTrue(target.UrlCombine("/", "test1/") = "/test1/")`
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