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    <p>You are doing the parse on the wrong thing. <code>arg.ToString()</code> will give you the string of <code>"System.Web.UI.WebControls.ServerValidateEventArgs"</code>, when you actually want to the <code>arg.Value</code> (which is already a string)</p> <p>So, instead of...</p> <pre><code>bool isNum = int.TryParse(arg.ToString(), out num); </code></pre> <p>Change it to (note the <code>.Value</code>)...</p> <pre><code>bool isNum = int.TryParse(arg.Value, out num); </code></pre> <p>Although it is a lot more complex than it actually needs to be. The whole thing could be rewritten a lot more comprehensively like this...</p> <pre><code>protected void intValidate_Validate(object sender, ServerValidateEventArgs arg) { int num; arg.IsValid = int.TryParse(are.Value, out num); } </code></pre> <p>This is because <a href="http://msdn.microsoft.com/en-us/library/f02979c7.aspx" rel="nofollow">TryParse</a> will return a true if the conversion was successful, and false otherwise.</p> <p>And as a final thought, all this could be achieved using the <code>&lt;asp:RequiredFieldValidator ...&gt;</code>, <code>&lt;asp:CompareValidator Operator="DataTypeCheck" Type="Integer" ...&gt;</code> and <code>&lt;asp:RangeValidator ...&gt;</code> validator controls.</p> <hr> <p><strong>UPDATE</strong></p> <p>As the OP points out, he doesn't want the error when when the textbox is empty, so instead try this...</p> <pre><code>protected void intValidate_Validate(object sender, ServerValidateEventArgs arg) { if (args.Value.Length &gt; 0) { int num; arg.IsValid = int.TryParse(are.Value, out num); } else { arg.IsValid = true; } } </code></pre> <p>And has already been pointed out by @HansKesting... this will only ever be called if all client-side validation is passed. As soon as client-side validation fails, the submission of the form back to the server is also cancelled.</p>
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    1. COThat's helpful. Part of the reason that I was trying to get the argument length is that I want it to be valid if there is no value passed in, but if there is an argument then it needs to be a number.
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    2. COAh, ok @ijb109 - that makes sense... in that case put the parse **within** the `if (args.Value.Length > 0)` no point doing it on an empty string
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    3. COJust to be certain, this will only activate when the submit button is clicked, correct? In this case, then, the client-side validation would keep it from validating, so to test it I would have to take that off.
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