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    <p><strong>Server.MapPath</strong> specifies the relative or virtual path to map <strong>to a physical directory</strong>.</p> <ul> <li><code>Server.MapPath(".")</code><sup>1</sup> returns the current physical directory of the file (e.g. aspx) being executed</li> <li><code>Server.MapPath("..")</code> returns the parent directory</li> <li><code>Server.MapPath("~")</code> returns the physical path to the root of the application</li> <li><code>Server.MapPath("/")</code> returns the physical path to the root of the domain name (is not necessarily the same as the root of the application)</li> </ul> <p><em>An example:</em></p> <p>Let's say you pointed a web site application (<code>http://www.example.com/</code>) to</p> <pre><code>C:\Inetpub\wwwroot </code></pre> <p>and installed your shop application (sub web as virtual directory in IIS, marked as application) in </p> <pre><code>D:\WebApps\shop </code></pre> <p>For example, if you call <code>Server.MapPath()</code> in following request:</p> <pre><code>http://www.example.com/shop/products/GetProduct.aspx?id=2342 </code></pre> <p>then:</p> <ul> <li><code>Server.MapPath(".")</code><sup>1</sup> returns <code>D:\WebApps\shop\products</code></li> <li><code>Server.MapPath("..")</code> returns <code>D:\WebApps\shop</code></li> <li><code>Server.MapPath("~")</code> returns <code>D:\WebApps\shop</code></li> <li><code>Server.MapPath("/")</code> returns <code>C:\Inetpub\wwwroot</code></li> <li><code>Server.MapPath("/shop")</code> returns <code>D:\WebApps\shop</code></li> </ul> <p>If Path starts with either a forward slash (<code>/</code>) or backward slash (<code>\</code>), the <code>MapPath()</code> returns a path as if Path was a full, virtual path. </p> <p>If Path doesn't start with a slash, the <code>MapPath()</code> returns a path relative to the directory of the request being processed.</p> <p><em>Note: in C#, <code>@</code> is the verbatim literal string operator meaning that the string should be used "as is" and not be processed for escape sequences.</em></p> <p><em>Footnotes</em></p> <ol> <li><code>Server.MapPath(null)</code> and <code>Server.MapPath("")</code> will <a href="https://stackoverflow.com/a/17616488/1185053">produce this effect too</a>.</li> </ol>
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    1. POServer.MapPath("."), Server.MapPath("~"), Server.MapPath(@"\"), Server.MapPath("/"). What is the difference?
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    1. POServer.MapPath("."), Server.MapPath("~"), Server.MapPath(@"\"), Server.MapPath("/"). What is the difference?
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    1. COExcellent. We've been battling with Server.Bloody.MapPath. Thanks
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    2. COYou will be better off using `HostingEnvironment.MapPath` as it doesn't require `HttpContext`: http://stackoverflow.com/q/944219/3205
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