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Stored procedure for custom paging in gridview

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Last Modified: 2012-05-11
regarding the stored procedure from
http://www.tipsntracks.com/316/gridview-custom-paging-in-asp-net-3-5-with-sql-server-stored-procedure.html
where it gives the custom paging functionality for ASP.NET gridview,
notice that the SrNo which is the identity,
given that
SELECT sName, sAddress,ClassName FROM  @tblStudentDtl WHERE SrNo > @start
and from
SET @start=@intPageSize*(@intCurrentPage - 1)

if we have pagesize = 10 , currentpage = 2,
it will have the equation of @start = 10 * (2 - 1)
which is  @start = 10

with that,
SELECT sName, sAddress,ClassName FROM  @tblStudentDtl WHERE SrNo >10
we will have been selecting (with pagesize = 10)
11, 12, 13, 14, 15, 16, 17, 18, 19, 20.

if for any reason we deleted records on ids
1,2, ... 20       (from 1 to 20)
and left 1001, 1002, 1003, 1004, 1005, 1006, -- 1020.

then with currentpage = 2
SELECT sName, sAddress,ClassName FROM  @tblStudentDtl WHERE SrNo >10
it will select
1001, 1002, --- 1010.
as they are records from 1st page rather than selecting record from 2nd page.

looking for clarification , and if any suggestions are okay.
CREATE procedure sp_StudentDtl
(
    @strSearchText varchar(100),
    @intPageSize int,
    @intCurrentPage int,
    @intTotalRecords int output
)
AS
BEGIN
 
– Author: <Chetankumar Akarte>
– Description: <Return Records depending on @intPageSize and @intCurrentPage.>
 
DECLARE @tblStudentDtl TABLE(
SrNo int IDENTITY not null,
sName varchar(50) ,
sAddress varchar(100),
ClassName varchar(100)
)
DECLARE @start int
SET @start=@intPageSize*(@intCurrentPage - 1)
 
INSERT INTO @tblStudentDtl (sName,sAddress,ClassName)
SELECT sName, sAddress,ClassName FROM tblStudent A JOIN tblClass B ON A.ClassId=B.ClassId WHERE sName like @strSearchText +‘%’ 
 
SELECT @intTotalRecords=Count(*) FROM tblStudent A JOIN tblClass B ON A.ClassId=B.ClassId WHERE sName like @strSearchText +‘%’ 
 
SET ROWCOUNT @intPageSize
SELECT sName, sAddress,ClassName FROM  @tblStudentDtl WHERE SrNo > @start
SET ROWCOUNT 0
 
END

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