Set interval between two entries on Button Click using webform C#

Question

I am currentyl facing issue ,that user click one time on Button ,then entry get inserted two time in system, so i want to set interval of 4 second between entries,mean that if User insert time 11:15:14 ,if user try to save another entry then it take 4 second ,means that next entry save on 11:15:19.

below is conde

ALTER PROCEDURE [dbo].[spInsertPorderder] 
    -- Add the parameters for the stored procedure here
    @Codeitem int,
    @OrderNo int,
    @prdqty int,
    @IDWoker int,
    @EntryDate date,
    @FID int,

    @Weight int,
    @SecID int,
    @Rmk varchar (50),
    @ETime time(7),
    @BrefNo varchar (50),
    @IPAddress [varchar](50) ,
    @Gweigth int,
    @OID int output


AS
BEGIN

    SET NOCOUNT ON;


        IF NOT EXISTS 
(
   SELECT ETIME, IPAddress,EntryDate  FROM Probale
   WHERE ETIME = @ETIME and IPAddress = @IPAddress and EntryDate=@EntryDate and Codeitem=@Codeitem
)
Begin 
        insert into Probale(Codeitem,OrderNo,prdqty,IDWokrer,EntryDate,FID,Weigth,SecID,Rmk,ETime,BrefNo,IPAddress,Gweigth ) 
    values(@Codeitem,@OrderNo,@prdqty,@IDWoker,@EntryDate,@FID,@Weight,@SecID,@Rmk,@ETime,@BrefNo,@IPAddress,@Gweigth )
    set @OID=SCOPE_IDENTITY()
end
end