insert,update delete in one common storeprocedure

thanks for your reply but please see my example

 
/****** Object:  StoredProcedure [dbo].[usp_SaveTask]    Script Date: 09/12/2014 11:42:56 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
  if(@cnt=0)Record insert
  if(@cnt!=0)Record Update
  if(@cnt!=??)Record delete????
 
Create  PROCEDURE [dbo].[usp_SaveTask] 
@Id bigint, 
@Subject nvarchar(128), 
@Details nvarchar(max), 
@TaskOwner nvarchar(56), 
@AssignTo  nvarchar(56), 
@Status nvarchar(56), 
@Priority nvarchar(56), 
@StartDate datetime, 
@DueDate datetime, 
@ReminderDate datetime =null, 
@isReminder bit, 
@IsActive bit 
  
AS 
BEGIN 
 Declare @Cnt Int;             
       Set @Cnt =0;             
Select @Cnt =Count(Id) From tblTask where  Id=@Id  
If(@Cnt=0)   
Begin   
 select @Id=isnull(max(Id+1),1) from tblTask  
 insert into tblTask(Id,[Subject],Details,TaskOwner,AssignTo,[Status],[Priority],StartDate,DueDate,ReminderDate,isReminder,IsActive,CreatedOn)values 
 (@Id,@Subject,@Details,@TaskOwner,@AssignTo,@Status,@Priority,@StartDate,@DueDate,@ReminderDate,@isReminder,@IsActive,getdate())   
End 
Else 
begin 
update tblTask set 

 
ReminderDate=@ReminderDate, 
isReminder=@isReminder, 
[Priority]= @Priority ,  
ModifiedOn=getdate() 
where Id=@Id 
End  
else if(@cnt=??)
begin
delete tblTask where where Id=@Id
end

END 

check this procedure

CREATE PROCEDURE [dbo].[PROC_IND_MAST]
 (@IDM_ID int,@SCM_ID int,@HDM_ID int,@IDM_NAME varchar(60)
,@IDM_SNAME varchar(20),@IDM_TIMEPERIOD varchar(50)
,@IDM_STATUS int,@USER_ID int,@TRANSTYPE VARCHAR(2))
AS
BEGIN
    IF(@TRANSTYPE='I')
        BEGIN
            SELECT @IDM_ID=ISNULL(MAX(IDM_ID),0)+1 FROM IND_MAST;
            INSERT INTO IND_MAST
           (IDM_ID,SCM_ID,HDM_ID,IDM_NAME,IDM_SNAME,IDM_TIMEPERIOD,IDM_DATE,IDM_STATUS,USER_ID)
     VALUES
           (@IDM_ID ,@SCM_ID ,@HDM_ID ,@IDM_NAME
           ,@IDM_SNAME ,@IDM_TIMEPERIOD,getdate()
           ,@IDM_STATUS,@USER_ID)
        END
    ELSE IF(@TRANSTYPE='U')
        BEGIN
            UPDATE IND_MAST
               SET
                   SCM_ID = @SCM_ID
                  ,HDM_ID = @HDM_ID
                  ,IDM_NAME = @IDM_NAME
                  ,IDM_SNAME = @IDM_SNAME
                  ,IDM_TIMEPERIOD = @IDM_TIMEPERIOD
                  ,IDM_DATE = getdate()
                  ,IDM_STATUS = @IDM_STATUS
                  ,USER_ID = @USER_ID
             WHERE IDM_ID = @IDM_ID 
        END
    ELSE IF(@TRANSTYPE='D')
        BEGIN
            DELETE FROM IND_MAST WHERE IDM_ID = @IDM_ID
        END
END