asp.net - How to get a gridview to show all table rows when no text is entered in a dependent textbox? -


the below works correctly , filters gridview based on text entered in textbox.

when no text entered textbox no results , cannot understand why.

my question

how gridview show all table rows when no text entered in textbox?

mssql

@search nvarchar(50)  select  [table].[column]    [table]   [table].[column] '%' + @search + '%' or coalesce(@search,'') = ''

markup

<asp:textbox id="txtsearch" runat="server" text=""/>  <asp:sqldatasource id="sqlsearch" runat="server" selectcommand="spsearch" selectcommandtype="storedprocedure">   <selectparameters>     <asp:controlparameter type="string" name="search" controlid="txtsearch" propertyname="text"/>   </selectparameters>  </asp:sqldatasource>

results gridview

i have tried , tested many methods found on here return 0 results when string empty.

look @ cancelselectonnullparameter - default, prevents select command being called when select parameter's value null. after setting false, select sp still called if text box empty, e.g. 

<asp:sqldatasource id="sqlsearch" runat="server"      cancelselectonnullparameter="false" ...> </asp:sqldatasource>

the sqldatasource seems bit misleading me here, because textbox.text returns string.empty when it's empty, not null, therefore wouldn't expect have mess cancelselectonnullparameter textbox, seems have to.


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