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POASP.NET - SQLDataSource - FilterExpression - Problem with Empty Strings
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2010-01-19T17:37:41.650
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In this test application, I am filtering by two ControlParameters. As you can see in the first codeblock, both parameters have a default value of %. This code works great. However, in the second code block, please note that the Default Values are eliminated. The second code block works as long as neither Textbox's text is blank. For some reason, when .NET evaluates the filter expression and inserts "" into the expression, it seems to bug out and case none of my results to be filtered. I am able to verify this behavior by setting the defaultvalue="" for each ControlParameter. Obviously I have found a workaround, but I would like to know why the FilterExpression breaks down when an empty string is provided. Any ideas? Code Block 1: <pre><code> <asp:SqlDataSource ID="Customer_Data" runat="server" ConnectionString='<%$ ConnectionStrings:connectionString %>' SelectCommand="SELECT Station, StoreFront, CustomerID as CustID FROM vStations" ProviderName="System.Data.SqlClient" FilterExpression="StoreFront LIKE '%{0}%' and CustID LIKE '{1}%'" EnableCaching="True" CacheDuration="60"> <FilterParameters> <asp:ControlParameter ControlID="TextBox1" PropertyName="Text" DefaultValue="%" /> <asp:ControlParameter ControlID="TextBox2" PropertyName="Text" DefaultValue="%" /> </FilterParameters> </asp:SqlDataSource> </code></pre> Code Block 2: <pre><code> <asp:SqlDataSource ID="Customer_Data" runat="server" ConnectionString='<%$ ConnectionStrings:connectionString %>' SelectCommand="SELECT Station, StoreFront, CustomerID as CustID FROM vStations" ProviderName="System.Data.SqlClient" FilterExpression="StoreFront LIKE '%{0}%' and CustID LIKE '{1}%'" EnableCaching="True" CacheDuration="60"> <FilterParameters> <asp:ControlParameter ControlID="TextBox1" PropertyName="Text" /> <asp:ControlParameter ControlID="TextBox2" PropertyName="Text" /> </FilterParameters> </asp:SqlDataSource> </code></pre>
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<.net><asp.net><gridview><filter><sqldatasource>
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ASP.NET - SQLDataSource - FilterExpression - Problem with Empty Strings
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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.