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    <p>Try: <code>File.Copy(@"c:\Program Files(86)\Program Folder\mydll.dll", @"C:\mydll.dll");</code></p> <p>To <em>force overwrite</em> simply use:</p> <p><code>File.Copy(@"c:\Program Files(86)\Program Folder\mydll.dll", @"C:\mydll.dll",true);</code> as per <a href="http://msdn.microsoft.com/en-us/library/9706cfs5.aspx" rel="nofollow">MSDN docs</a>:</p> <pre><code>public static void Copy( string sourceFileName, string destFileName, bool overwrite ) </code></pre> <blockquote> <p>Parameters</p> <p>sourceFileName Type: System.String The file to copy.</p> <p>destFileName Type: System.String The name of the destination file. This cannot be a directory.</p> <p>overwrite Type: System.Boolean true if the destination file can be overwritten; otherwise, false.</p> </blockquote> <p>As noted in another answer you may not have appropriate permissions you can try checking this by:</p> <pre><code>string directoryPath = @"c:\Program Files(86)\Program Folder"; bool isWriteAccess = false; try { AuthorizationRuleCollection collection = Directory.GetAccessControl(directoryPath).GetAccessRules(true, true, typeof(System.Security.Principal.NTAccount)); foreach (FileSystemAccessRule rule in collection) { if (rule.AccessControlType == AccessControlType.Allow) { isWriteAccess = true; break; } } } catch (UnauthorizedAccessException ex) { isWriteAccess = false; } catch (Exception ex) { isWriteAccess = false; } if (!isWriteAccess)//we cant write to location { //handle notifications }else {//we can write to the location } </code></pre>
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