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    <p>Let me see if I understand... you have a DB lookup table with user info and you want all the user names from a list of all the user ids? You dont need a foreach loop at all unless you are doing more processing. I suspect even that could be done in the select. Try this linq statement...</p> <pre><code>List&lt;string&gt; UserNameList = context.KULLANICILAR.Where(x=&gt; MyIntegerIdValues.Contains(x.UserId)).Select(x=&gt;x.UserName).ToList(); </code></pre> <p>As a full LinqPad sample check out the below code. The output is below also...</p> <pre><code>public class KULLANICILARItem { public int UserId {get;set;} public string UserName {get;set;} } void Main() { // Fake DB Context List&lt;KULLANICILARItem&gt; KULLANICILAR = new List&lt;KULLANICILARItem&gt;() { new KULLANICILARItem() { UserId = 1, UserName = "Bob" }, new KULLANICILARItem() { UserId = 2, UserName = "Jane" }, new KULLANICILARItem() { UserId = 3, UserName = "Soner" }, }; // Fake ID List List&lt;int&gt; MyIntegerIdValues = new List&lt;int&gt;() { 1, 2, 3 }; List&lt;string&gt; UserNameList = KULLANICILAR.Where(x=&gt; MyIntegerIdValues.Contains(x.UserId)).Select(x=&gt;x.UserName).ToList(); UserNameList.Dump(); } Output: Bob Jane Soner </code></pre> <p>To loop over a list of lists, you need only move the string list definition outside of the foreach loop and then add range.</p> <pre><code>public class KULLANICILARItem { public int UserId {get;set;} public string UserName {get;set;} } void Main() { // Fake DB Context List&lt;KULLANICILARItem&gt; KULLANICILAR = new List&lt;KULLANICILARItem&gt;() { new KULLANICILARItem() { UserId = 1, UserName = "Bob" }, new KULLANICILARItem() { UserId = 2, UserName = "Jane" }, new KULLANICILARItem() { UserId = 3, UserName = "Soner" }, new KULLANICILARItem() { UserId = 4, UserName = "Jim" } }; List&lt;string&gt; UserNameList = new List&lt;string&gt;(); foreach(var StringIdValues in new string[] { "1,2", "3,4"} ) { List&lt;int&gt; MyIntegerIdValues = StringIdValues.Split(',').Select(i =&gt; int.Parse(i)).ToList(); UserNameList.AddRange(KULLANICILAR.Where(x=&gt; MyIntegerIdValues.Contains(x.UserId)).Select(x=&gt;x.UserName).ToList()); } UserNameList.Dump(); } </code></pre>
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    1. COit works only for first list i have many lists i need foreach do you have any idea ?
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    2. COGive me more details. Perhaps some code.
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    3. COMyIntegerIdValues has datas. 1. data : 1, 2, 3 2. data : 6,7,8 Your code works only for 1. data not second one. That is why i need foreach till datas finish
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