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    <p>A similar question was answered in <a href="https://stackoverflow.com/questions/337704/parameterizing-an-sql-in-clause">Parameterize an SQL IN clause</a></p> <p>The same idea can be applied here:</p> <pre><code>declare @EmailIds varchar = '|email1@test.com|email2@test.com|'; UPDATE dbo.My_Users SET MyUserId=@MyUserId WHERE @EmailIds LIKE '%|' + EmailID + '|%'; </code></pre> <p>Though this does not contain a comma-separated list, the delimiter could easily be changed to a pipe-character. The caveat here is, the more data that exists in the table and the more email addresses that are in the @EmailIds list, the slower (much slower) this query can become.</p> <p>Using C#, I would actually recommend the second example in the above-mentioned question where the list is expanded to create a query similar to:</p> <pre><code>UPDATE dbo.My_Users SET MyUserId=@MyUserId WHERE EmailID IN (@email1, @email2); </code></pre> <p>C# to implement (a modified version of the example in the question above):</p> <pre><code>string[] emails = new string { "email1@test.com", "email2@test.com" }; string sql = "UPDATE dbo.My_Users SET MyUserId=@MyUserId WHERE EmailID IN ({0});" string[] emailParams = emails.Select((s, i) =&gt; "@email" + i.ToString()).ToArray(); string inClause = string.Join(",", emailParams); using (SqlCommand cmd = new SqlCommand(string.Format(sql, inClause))) { for(int i = 0; i &lt; emailParams.Length; i++) { cmd.Parameters.AddWithValue(emailParams[i], emails[i]); } } </code></pre>
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