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    <p>Using parameterized queries would go long way toward protecting you from SQL injection attacks, because most bad things happen in the value portion of your <code>where</code> conditions.</p> <p>For exampleg given a condition <code>a=="hello" &amp;&amp; b=="WORLD"</code>, do this:</p> <pre><code>select a,b,c,d from table where a=@pa and b=@pb -- this is generated dynamically </code></pre> <p>Then, bind <code>@pa="hello"</code> and <code>@pb="WORLD"</code>, and run your query.</p> <p>In C#, you would start with an in-memory representation of your <code>where</code> clause in hand, go through it element-by-element, and produce two output objects:</p> <ul> <li>A string with the <code>where</code> clause, where constants are replaced by automatically generated parameter references <code>pa</code>, <code>pb</code>, and so on (use your favorite naming scheme for these blind parameters: the actual names do not matter)</li> <li>A dictionary of name-value pairs, where names correspond to the parameters that you've inserted in your <code>where</code> clause, and values that correspond to the constants that you pulled from the expression representation.</li> </ul> <p>With these outputs in hand, you prepare your dynamic query using the string, add parameter values using the dictionary, and then execute the query against your RDBMS source.</p> <p><strong>DO NOT DO THIS</strong></p> <pre><code>select a,b,c,d from table where a='hello' and b='WORLD' -- This dynamic query is ripe for an interjection attack </code></pre>
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    1. CORight... so do you have any idea how I can use parameters when the fields and operators are dynamic?
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    2. COClarification - I know how to use parameters. The issue here is the parameters, parameter values and operators are dynamic. So I can't simply add parameters like I would usually do.
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    3. CO@Becky I just edited the answer to include general info on how to extract parameters from your query expression representation.
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