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    <p>It looks like you are missing the #</p> <pre><code>&lt;td&gt; &lt;%#(DateTime.Today.Subtract(DateTime.Parse(DataBinder.Eval(Container.DataItem, "BeneficiaryBirthday").ToString())).Days / 365).ToString()%&gt;&lt;/td&gt; </code></pre> <p>As an alternative though, consider creating a method to wrap your collection and using the foreach:</p> <pre><code>&lt;table&gt; &lt;tr&gt; &lt;td class="labels displayInput_noWidth"&gt;Last Name&lt;/td&gt; &lt;td class="labels displayInput_noWidth"&gt;First Name&lt;/td&gt; &lt;td class="labels displayInput_noWidth"&gt;Middle Name&lt;/td&gt; &lt;td class="labels displayInput_noWidth"&gt;Aka&lt;/td&gt; &lt;td class="labels displayInput_75w"&gt;Birthday&lt;/td&gt; &lt;td class="labels displayInput_noWidth"&gt;Age&lt;/td&gt; &lt;/tr&gt; &lt;% foreach (var beneficiary in GetBenificiaries()) {%&gt; &lt;tr&gt; &lt;td&gt;&lt;%= beneficiary.BeneficiaryLastName %&gt;&lt;/td&gt; &lt;td&gt;&lt;%= beneficiary.BeneficiaryFirstName %&gt;&lt;/td&gt; &lt;td&gt;&lt;%= beneficiary.BeneficiaryMiddleName %&gt;&lt;/td&gt; &lt;td&gt;&lt;%= beneficiary.BeneficiaryAka %&gt;&lt;/td&gt; &lt;td&gt;&lt;%= beneficiary.BeneficiaryBirthday.ToString("MM/dd/yyyy")%&gt;&lt;/td&gt; &lt;td&gt; &lt;% DateTime.Now.Subtract(beneficiary.BeneficiaryBirthday).Days / 365%&gt;&lt;/td&gt; &lt;/tr&gt; &lt;%}%&gt; </code></pre> <p></p> <p>This way it is a lot more readable, you get strong typed intellisense, it matches more closely with MVC if you ever migrate, and if you use tools like resharper, they will be able to refactor these changes better</p>
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    1. POHow to do date subtraction on an item in a repeater asp.net
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    1. COI disagree. In the context of WebForms, Repeater is the way to go here. If you want something like you suggest, make the move to ASP.NET MVC and do it properly with razor. What you suggest is a step back from ASP.NET to old ASP code generation.
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    2. COIgnore fact I mentioned MVC, but their are still a lot of advantages to that approach. Being able to use strong typing over the DataBinder and explicit casting/parsing is enough of a win for me. In the end, either approach will need to use the classic ASP server tags.
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    3. COYou can achieve strong typing, explicit parsing and intellisense with ASP.NET 4.5 as well: http://weblogs.asp.net/scottgu/archive/2011/09/02/strongly-typed-data-controls-asp-net-vnext-series.aspx
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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