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PO
 

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  1. PO
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    <p>My question: <em>"Must all row's fields match with the same row's fields of the other DataTable?"</em></p> <p>Your answer: <em>"no just the id"</em></p> <p>You can first check if both <code>DataTables</code> are null or both have the same row-count. Then you can use LINQ to determine if both have the same IDs using <a href="http://msdn.microsoft.com/en-us/library/bb300779.aspx" rel="nofollow"><code>Enumerable.Except</code></a>:</p> <pre><code>var dt1IDs = DT1.AsEnumerable().Select(r =&gt; r.Field&lt;int&gt;("id")); var dt2IDs = DT2.AsEnumerable().Select(r =&gt; r.Field&lt;int&gt;("id")); var diff = dt1IDs.Except(dt2IDs); var equal = DT1.Rows.Count == DT2.Rows.Count &amp;&amp; !diff.Any(); </code></pre> <p>Explanation: <code>diff.Any()</code> returns true when there's at least one id in DT1 that is not in DT2.</p> <p><strong>Edit</strong>: If the ID is <strong>not</strong> unique and might repeat you need to check whether all ID's in DT1 are also in DT2 and all IDs of DT2 are in DT1:</p> <pre><code>var DT1InDT2 = dt1IDs.Except(dt2IDs); var DT2InDT1 = dt2IDs.Except(dt1IDs); var equal = DT1.Rows.Count == DT2.Rows.Count &amp;&amp; !DT1InDT2.Any() &amp;&amp; !DT2InDT1.Any(); </code></pre> <p>This query is efficient anyway.</p> <hr> <p><strong>Edit2</strong>: I've just seen that i've misunderstood your requiremnet a little bit. You only want to know if the first table contains the second, not vice-versa. </p> <pre><code>var DT2IdNotInDT1 = dt2IDs.Except(dt1IDs); var equal = !DT2IdNotInDT1.Any(); </code></pre>
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    1. POHow to detect that a datatable is a part of another datatable
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    1. USTim Schmelter
    1. USTim Schmelter
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    1. POHow to detect that a datatable is a part of another datatable
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    1. COI try it the first ids(200,300,146) the second ids (200,300) so it should return true not false but it return `false`
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      1. USAnyname Donotcare
    2. COno the ids are unique but should i rely on the diff only ?? please check the above comment
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      1. USAnyname Donotcare
    3. CO@just_name: Of course it returns false since the first table has 3 records whereas the second has only two.
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      1. USTim Schmelter
 

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