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POCatching null values on databinding
 

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    <p>I have a dropdownlist that is populated from an SQL select statement. The select statement filters for items where the 'bit' is set to false and the items, although still in the database are hidden.</p> <p>My problem is; when an item is out of stock or hidden (bit = false) the user may still have items that are now hidden so it throws an error. How and where can I catch this, show the original item or set the value to default?</p> <pre><code>protected void GradeDropDownList_DataBinding (object sender, EventArgs e) { var ddl = (DropDownList)(sender); var a = ((Label)MyDetailsView.FindControl("GradeLabelEdit")).Text; a = a.Trim(); if (a != "") { ddl.SelectedValue = a; } } </code></pre> <p>The select statement;</p> <pre><code> &lt;asp:SqlDataSource ID="getGrade" runat="server" ConnectionString="&lt;%$ ConnectionStrings:CasesTimeConnection %&gt;" SelectCommand="SELECT [gradeID], [gradeText] FROM [user_grades] WHERE ([visibleState] = @visibleState)"&gt; &lt;SelectParameters&gt; &lt;asp:Parameter DefaultValue="True" Name="visibleState" Type="Boolean" /&gt; &lt;/SelectParameters&gt; &lt;/asp:SqlDataSource&gt; </code></pre> <p>In page;</p> <pre><code>&lt;EditItemTemplate&gt; &lt;asp:DropDownList ID="GradeDropDownList" runat="server" DataSourceID="getGrade" DataTextField="gradeText" DataValueField="gradeID" OnDataBinding="GradeDropDownList_DataBinding" OnSelectedIndexChanged="GradeDropDownList_SelectedIndexChanged"&gt; &lt;/asp:DropDownList&gt; &lt;/EditItemTemplate&gt; &lt;ItemTemplate&gt; &lt;asp:Label ID="gradeLabel" runat="server" Text='&lt;%# Bind("gradeText") %&gt;'&gt;&lt;/asp:Label&gt; &lt;/ItemTemplate&gt; </code></pre>
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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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