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    <p>You can put (and <strong>should</strong>!) parameters into your SQL queries for the values in e.g. your <code>WHERE</code> clause - but you <strong>cannot</strong> parametrize stuff like your table name.</p> <p>So I'd rewrite that query to be:</p> <pre><code>SELECT (list of columns) FROM dbo.Actor WHERE ActorName = @ActorName </code></pre> <p>and then pass in just the value for <code>@ActorName</code>.</p> <p>If you need to do the same thing for directors, you'd have to have a second query</p> <pre><code>SELECT (list of columns) FROM dbo.Directors WHERE DirectorName = @DirectorName </code></pre> <p>Using parameters like this </p> <ul> <li>enhances security (prohibits SQL injection attacks!)</li> <li>enhances performance: the query plan for that query can be cached and reused for second, third runs</li> </ul> <p>PS: the original problem in your setup is this: you don't have any space between the first occurence of your table name and the <code>WHERE</code> clause - thus you would get:</p> <pre><code>SELECT * FROM ActorWHERE ActorName ='.....' </code></pre> <p>If you really insist on concatenating together your SQL statement (I would <strong>NOT</strong> recommend it!), then you need to put a space between your table name and your <code>WHERE</code> !</p> <p><strong>Update:</strong> some resources for learning about parametrized queries in ADO.NET:</p> <ul> <li><a href="http://www.csharp-station.com/Tutorials/AdoDotNet/Lesson06.aspx" rel="noreferrer">The C# Station ADO.NET Tutorial / Lesson 06: Adding Parameters to Commands</a></li> <li><a href="http://www.asp.net/data-access/tutorials/using-parameterized-queries-with-the-sqldatasource-cs" rel="noreferrer">Using Parameterized Queries with the SqlDataSource</a></li> </ul>
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    1. COThanks for the detailed reply, I am very very new to asp.net and c# and our instructor has just done concatenation with us. That said, I would love to know more about parametrized queries, I googled it but couldn't find any satisfactory introduction, something with code examples, is there a link you could direct me to? Anyway, thanks a lot for your help!
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    2. CO@QPTR: added some resource links
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    3. COThanks for the links!
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