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    copied!<p>OK hope you haven't solved this yet because I took a few minutes to come up with an example that I think will do pretty much what you want.</p> <p>DB access uses a stored procedure but you can use a ObjectDataSource with DAL, or just inline the SQL statement on the SqlDataSource, etc.</p> <p>Markup:</p> <pre><code>Product ID: &lt;asp:TextBox ID="TextBox1" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;asp:CompareValidator ID="CompareValidator1" ControlToValidate="TextBox1" runat="server" ErrorMessage="You must enter a number" ValidationGroup="vg1" Type="Integer" Operator="DataTypeCheck"&gt;&lt;/asp:CompareValidator&gt; &lt;br /&gt; Description: &lt;asp:TextBox ID="TextBox2" runat="server"&gt;&lt;/asp:TextBox&gt;&lt;br /&gt; &lt;asp:Button ID="cmdSearch" runat="server" Text="Search" ValidationGroup="vg1" /&gt;&lt;br /&gt; &lt;asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1"&gt; &lt;/asp:GridView&gt; &lt;asp:SqlDataSource ID="SqlDataSource1" runat="server" SelectCommand="spGetProducts" CancelSelectOnNullParameter="False" SelectCommandType="StoredProcedure"&gt; &lt;SelectParameters&gt; &lt;asp:ControlParameter ControlID="TextBox1" PropertyName="Text" DbType="String" DefaultValue="" /&gt; &lt;asp:ControlParameter ControlID="TextBox2" PropertyName="Text" DbType="Int32" DefaultValue="" /&gt; &lt;/SelectParameters&gt; &lt;/asp:SqlDataSource&gt; </code></pre> <p>And T-SQL for your query:</p> <pre><code>CREATE PROCEDURE spGetProducts @ProductId int = NULL ,@ProductDescription nvarchar(100) = NULL AS BEGIN SELECT [ProductId] ,[ProductDescription] FROM [Products] WHERE ( ( (@ProductId IS NULL) OR ([ProductId] LIKE % + @ProductId + %) ) AND ( (@ProductDescription IS NULL) OR ([ProductDescription] LIKE % + @ProductDescription + %;) ) ); END </code></pre> <p>If the user doesn't enter anything in either of the fields, the SqlDataSource will still bind due to <code>SqlDataSource.CancelSelectOnNullParameter = False</code> but the empty parameter will not be sent with the query due to <code>ControlParameter.DefaultValue</code> being set. The stored procedure will then insert the NULL value into the parameter and basically skip that part of the filtering in the WHERE clause.</p> <p>Hope this helps.</p>
 

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