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    <p>If you know the value of <code>sAMAccountName</code> and need to get <code>IADs</code> of the user you need first <em>find</em> the user in Active Directory by the <code>sAMAccountName</code> and get <code>distinguishedName</code> attribute of the user. You know already how to get <code>IADs</code> by <code>distinguishedName</code>.</p> <p>So you should just follow <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms676882%28v=vs.85%29.aspx#c___example" rel="nofollow">the code</a> from MSDN for example. First you get <code>IDirectorySearch</code> interface of the AD container of <code>defaultNamingContext</code> of <code>"LDAP://rootDSE"</code>.</p> <pre><code>IADs domain; ADsGetObject("LDAP://rootDSE", IADs, domain); </code></pre> <p>Then you use <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa746365%28v=vs.85%29.aspx" rel="nofollow">IDirectorySearch::ExecuteSearch</a> to apply search using the filter string:</p> <pre><code>(&amp;(objectClass=user)(objectCategory=person)(sAMAccountName=theName)) </code></pre> <p><strong>Note:</strong> The search filter syntax is described <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa746475%28v=vs.85%29.aspx" rel="nofollow">here</a>. </p> <pre><code>IDirectorySearch directorySearch = domain as IDirectorySearch; ADS_SEARCH_HANDLE searchHandle; directorySearch.ExecuteSearch( "(&amp;(objectClass=user)(objectCategory=person)(sAMAccountName=ian))", attributeNames, numberOfAttributes, out searchHandle); </code></pre> <ul> <li><p>you use the known value of <code>sAMAccountName</code> instead of <code>theName</code>. </p></li> <li><p>for <code>pAttributeNames</code> you can use <code>LPOLESTR</code> array which consist from <code>L"distinguishedName"</code> only (see <code>pszNonVerboseList</code> from the code example and look the code of <code>FindUsers</code> in case of <code>bIsVerbose</code> as <code>FALSE</code>). </p></li> </ul> <p>You should get <code>distinguishedName</code> attribute of first (and the only if any exist) found item. Having <code>distinguishedName</code> attribute you can use <code>AdsGetObject</code> to get the <code>IADs</code> of the user.</p> <p>Alternatively you can get <code>objectGUID</code> attribute of the user instead of <code>distinguishedName</code> attribute and use <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms677985%28v=vs.85%29.aspx" rel="nofollow">binding by GUID</a> syntax, but the usage of <code>distinguishedName</code> I personally find more clear and understandable.</p> <hr> <pre><code>public IADs GetUserObject(string samAccountName) { IADs ads; //Get the current domain's distinguished name (e.g. "dc=stackoverflow,dc=com") AdsGetObject("LDAP://rootDSE", IADs, ref ads); String dn = ads.Get("defaultNamingContext"); //"dc=stackoverflow,dc=com" //Get the the object of the current domain (e.g. LDAP://dc=stackoverflow,dc=com) AdsGetObject("LDAP://"+dn, IADs, ref ads); //Now we're going to search for the "distinguishedName" of this user //setup the search filter for the user we want String filter = "(&amp;(objectClass=user)(objectCategory=person)(sAMAccountName="+samAccountName+"))"; //specify that we only need to return one attribute, distinguishedNamem, //otherwise it returns all attributes and is a waste of resources String[] searchAttributes = { "distinguishedName" }; //run the search IDirectorySearch ds = ads as IDirectorySearch; ADS_SEARCH_HANDLE searchHandle; ds.ExecuteSearch(filter, searchAttributes, 1, out searchHandle); ds.GetFirstRow(searchHandle); //Now get the details of the "distinguishedName" column ADS_SEARCH_COLUMN column; ds.GetColumn(searchHandle, "distinguishedName", ref column); //Get the user's distinguishedName String dn = column.pADsValues.DNString; //Now that we have the user's distinguishedName, we can do what we really wanted: AdsGetObject("LDAP://"+dn, IADs, ads); return ads; } </code></pre> <p>This means that conceptually it can be broken down into two steps: </p> <ul> <li>getting a user's <strong>distinguishedName</strong> from their <code>samAccountName</code></li> <li>fetching the <code>IADs</code> for a <strong>distinguishedName</strong></li> </ul> <p>And splitting the code:</p> <pre><code>public IADs GetUserObject(string samAccountName) { String userDistinguishedName = GetUserDistinguishedName(samAccountName); return GetObject("LDAP://"+userDistingishedName); } public String GetUserDistinguishedName(string samAccountName) { //Get the current domain's distinguished name (e.g. "dc=stackoverflow,dc=com") IADs ads = GetObject("LDAP://rootDSE"); String dn = ads.Get("defaultNamingContext"); //"dc=stackoverflow,dc=com" //Get the the object of the current domain (e.g. LDAP://dc=stackoverflow,dc=com) ads := GetObject("LDAP://"+dn); //Now we're going to search for the "distinguishedName" of this user //setup the search filter for the user we want String filter = '(&amp;(objectClass=user)(objectCategory=person)(sAMAccountName='+samAccountName+'))'; //specify that we only need to return one attribute, distinguishedNamem, //otherwise it returns all attributes and is a waste of resources String[] searchAttributes = { "distinguishedName" }; //run the search IDirectorySearch ds = ads as IDirectorySearch; ADS_SEARCH_HANDLE searchHandle; ds.ExecuteSearch(filter, searchAttributes, 1, out searchHandle); ds.GetFirstRow(searchHandle); //Now get the details of the "distinguishedName" column ADS_SEARCH_COLUMN column; ds.GetColumn(searchHandle, "distinguishedName", ref column); //Get the user's distinguishedName return column.pADsValues.DNString; } </code></pre>
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