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PONested foreach loop slow
 

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    <p>The following piece of code achives the desired results, but performance is extremely slow: </p> <pre><code>SearchResultCollection absaUsers = ABSAds.FindAll(); SearchResultCollection srcUsers = ds.FindAll(); foreach (SearchResult users in srcUsers) { string cn = users.Properties["cn"][0].ToString(); string sn = users.Properties["sn"][0].ToString(); string userID = users.Properties["uid"][0].ToString(); string description = users.Properties["PersonnelAreaDesc"][0].ToString(); string jobCodeID = users.Properties["JobcodeID"][0].ToString(); string CostCentreID = users.Properties["costCentreID"][0].ToString(); string CostCentreDescription = users.Properties["CostCentreDescription"][0].ToString(); string givenName = users.Properties["givenName"][0].ToString(); string employmentStatus = users.Properties["EmploymentStatus"][0].ToString(); string EmploymentStatusDescription = users.Properties["EmploymentStatusDescription"][0].ToString(); foreach (SearchResult absaUser in absaUsers) { string absaUID = absaUser.Properties["uid"][0].ToString(); string absaEmploymentStatus = absaUser.Properties["EmploymentStatus"][0].ToString(); string absaEmploymentStatusDescription = absaUser.Properties["EmploymentStatusDescription"][0].ToString(); string absaEmployeeNumber = absaUser.Properties["employeeNumber"][0].ToString(); if (absaUID == cn &amp;&amp; absaEmployeeNumber==userID) { Console.WriteLine("User Record Found:" + cn); sw.WriteLine("Modify" + "," + cn + "," + description + "," + userID + "," + givenName + "," + sn + "," + jobCodeID + "," + CostCentreID + "," + CostCentreDescription + "," + sn + "," + cn + "," + employmentStatus + "," + EmploymentStatusDescription); sw.Flush(); break; } } } </code></pre> <p>It loops through 2 collections and mtaches the outer loops attributes with the inner's. Any suggestions on how I can optimise the performance? </p>
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    1. COAny statistics on performance measurements? How many items in the lists `absaUsers` and `srcUsers`?
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    2. COIf this all come from database, you better do it in the SQL level and Join the tables, fetching only the data you need..
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    3. COSorry for not being very specific. This program connects 2 different LDAP Stores, and compares user attributes. absaUsers contain about 50 000 users and scrUsers contain about 11 000
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