how to call sql server function in asp.net

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ASP.NET

I have following function in sql server. how to use this function in front end.basically this function is for city already exist or no.so,plz help me?

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go


ALTER FUNCTION [QAPower].[CITY_ALREADY_EXISTS] (@CITY_DESC VARCHAR(MAX),@RECORD_TYPE BIT,@COUNTRY_ID TINYINT,@CITY_ID TINYINT)

RETURNS BIT

AS
BEGIN
    DECLARE  @RESULT TINYINT

         IF(@RECORD_TYPE=0)
          SET @RESULT=(SELECT COUNT (*) FROM QAPower.HDR_CITY WHERE CITY_DESC=@CITY_DESC AND COUNTRY_ID=@COUNTRY_ID)
        ELSE
          SET @RESULT=(SELECT COUNT (*) FROM QAPower.HDR_CITY WHERE CITY_DESC=@CITY_DESC AND  NOT (COUNTRY_ID=@COUNTRY_ID AND CITY_ID=@CITY_ID))

    IF (@RESULT) > 0
        RETURN 1
    ELSE
       RETURN  0

    RETURN 1
END