On pageload i want to show all fields in repeater control and on typing licenseid in the textbox i want to show that specific licenceid details

IF I place below code in the datasource of repeater,First one is not working.In the second one i placed a textbox and put its value to 0 on pageload.it is working.But i want both to be working.

 SELECT * FROM License WHERE (0 = @selectAll OR LicenseID=@LicenseID) -> Not working 

 SELECT * FROM License WHERE (0 = @selectAll ) ->working

 SELECT * FROM License WHERE (LicenseID=@LicenseID)-> working

Thanks in advance for the help