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    <p>One potential issue with your technique is that it doesn't handle very large lists - you may exceed the maximum string length for your database. I use a helper method that concatenates the integer values into an enumeration of strings, each of which is less than a specified maximum (the following implementation also optionally checks for and removes duplicates ids):</p> <pre><code>public static IEnumerable&lt;string&gt; ConcatenateValues(IEnumerable&lt;int&gt; values, string separator, int maxLength, bool skipDuplicates) { IDictionary&lt;int, string&gt; valueDictionary = null; StringBuilder sb = new StringBuilder(); if (skipDuplicates) { valueDictionary = new Dictionary&lt;int, string&gt;(); } foreach (int value in values) { if (skipDuplicates) { if (valueDictionary.ContainsKey(value)) continue; valueDictionary.Add(value, ""); } string s = value.ToString(CultureInfo.InvariantCulture); if ((sb.Length + separator.Length + s.Length) &gt; maxLength) { // Max length reached, yield the result and start again if (sb.Length &gt; 0) yield return sb.ToString(); sb.Length = 0; } if (sb.Length &gt; 0) sb.Append(separator); sb.Append(s); } // Yield whatever's left over if (sb.Length &gt; 0) yield return sb.ToString(); } </code></pre> <p>Then you use it something like:</p> <pre><code>using(SqlCommand command = ...) { command.Connection = ...; command.Transaction = ...; // if in a transaction SqlParameter parameter = command.Parameters.Add("@Items", ...); foreach(string itemList in ConcatenateValues(values, "~", 8000, false)) { parameter.Value = itemList; command.ExecuteNonQuery(); } } </code></pre>
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    1. POPassing List<> to SQL Stored Procedure
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    1. USJoe
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    1. COGood point, I hadn't thought about exceeding the string lengths. Though I doubt I'll have cases that even come close, it's good to learn this, thanks!
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      1. USRyan Abbott
 

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