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write a if condition in where clause

Posted By:      Posted Date: October 04, 2010    Points: 0   Category :ASP.Net

hi, my sql query gives me all record when i  am not passing  " lastname" in parameter


ALTER PROCEDURE [dbo].[Usp_LeadSearch]
@FirstName varchar(20)='',
@LastName varchar(20)=''

                set @FirstName=null
                set @LastName=null

    select L.Leadid,(L.FirstName+' ' + L.LastName) as name,LS.LeadSource,LStatus.LeadStatus,L.LeadOwner,(UM.FirstName+' '+UM.LastName)as OwnerName,convert(varchar,L.CreatedDate,110)as CreatedDate,L.IsActive,AM.ActivityType,AT.ActivityName,AM.CreateDate as activitydate
    from LeadMast L left join ActivityMast AM on L.Leadid=AM.Leadid
                    join LeadSource LS on LS

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