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copied!<p>You can work out if a local account exists through the <a href="https://msdn.microsoft.com/en-us/library/system.security.principal.aspx" rel="nofollow noreferrer"><code>System.Security.Principal</code></a> namespace using the following code. </p> <pre><code>bool AccountExists(string name) { bool bRet = false; try { NTAccount acct = new NTAccount(name); SecurityIdentifier id = (SecurityIdentifier)acct.Translate(typeof(SecurityIdentifier)); bRet = id.IsAccountSid(); } catch (IdentityNotMappedException) { /* Invalid user account */ } return bRet; } </code></pre> <p>Now getting group membership is slightly harder, you can easily do it for the current user using the <a href="https://msdn.microsoft.com/en-us/library/system.security.principal.windowsprincipal.isinrole.aspx" rel="nofollow noreferrer"><code>WindowsPrinciple.IsInRole</code></a> method (creating a principle from the <a href="https://msdn.microsoft.com/en-us/library/sfs49sw0.aspx" rel="nofollow noreferrer"><code>WindowsIdentify.GetCurrent()</code></a> method). </p> <p>As pointed out I don't think there is a way of getting anything else without resorting to PInvoke or WMI. So here is a bit of code to check group membership with WMI.</p> <pre><code>bool IsUserInGroup(string name, string group) { bool bRet = false; ObjectQuery query = new ObjectQuery(String.Format("SELECT * FROM Win32_UserAccount WHERE Name='{0}' AND LocalAccount=True", name)); ManagementObjectSearcher searcher = new ManagementObjectSearcher(query); ManagementObjectCollection objs = searcher.Get(); foreach (ManagementObject o in objs) { ManagementObjectCollection coll = o.GetRelated("Win32_Group"); foreach (ManagementObject g in coll) { bool local = (bool)g["LocalAccount"]; string groupName = (string)g["Name"]; if (local && groupName.Equals(group, StringComparison.InvariantCultureIgnoreCase)) { bRet = true; break; } } } return bRet; } </code></pre>

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