could any one show what's wrong with my stored procedure?

Question

I have writtent the following code to do a simple update operation, UI is a DataGrid according to my test new data passes to the
Update() also the orignal data was preserved and the problem in in the update stored procedure.. could any one see whats the problem is?
I have the folllwong in update() with the code:

 

  public int Update(int iEmpIndex, string strPassword, string 
strFirstName,
                            
string strLastName, int iDesigIndex, int 
iUsedAnnualLeaves,
                            
int iUsedSickLeaves, DateTime enteredate, DateTime 
updatedDate)
        
{
            
try
            
{
                
//updating the DB: VALUES PASSED CORRECTLY BUT DOESNT PERFORM THE 
TASK
                
return empAdapter.Update(strPassword, strFirstName, strLastName, 
iDesigIndex,
                    
iUsedAnnualLeaves, iUsedSickLeaves, enteredate, updatedDate, 
this.OldEmpIndex,
                    
this.OldPassword, this.OldFirstName, this.OldLastName, 
this.OldDesigIndex,
                    
this.OldUsedAnnualLeaves, this.OldUsedSickLeaves, this.OldEnteredDate, 

                    
this.OldUpdatedDate);
            
}
            
catch
            
{
                
throw;
            
}
        }

thsi update satement maps to the stored procedure that has the followin SQL 
query: 
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER 
PROCEDURE [dbo].[ProcUpdateEmployee]
(
 @Password 
nvarchar(50),
 @FirstName nvarchar(50),
 @LastName 
nvarchar(50),
 @DesigIndex int,
 @UsedAnnualLeaves 
int,
 @UsedSickLeaves int,
 @EntryDate 
datetime,
 @UpdatedDate datetime,
 @Original_EmpIndex 
int,
 @Original_Password nvarchar(50),
 @Original_FirstName 
nvarchar(50),
 @Original_LastName 
nvarchar(50),
 @Original_DesigIndex 
int,
 @Original_UsedAnnualLeaves int,
 @Original_UsedSickLeaves 
int,
 @Original_EntryDate datetime,
 @Original_UpdatedDate 
datetime,
 @EmpIndex int
)
AS
 SET NOCOUNT OFF;
UPDATE 
[tblEmployees] 
SET 
[Password] = @Password, 
[FirstName] = @FirstName, 

[LastName] = @LastName, 
[DesigIndex] = @DesigIndex, 

[UsedAnnualLeaves] = @UsedAnnualLeaves, 
[UsedSickLeaves] = 
@UsedSickLeaves, 
[EntryDate] = @EntryDate, 
[UpdatedDate] = @UpdatedDate 

WHERE (([EmpIndex] = @Original_EmpIndex) 
AND 
([Password] = 
@Original_Password) 
AND 
([FirstName] = @Original_FirstName) 
AND 

([LastName] = @Original_LastName) 
AND 
([DesigIndex] = 
@Original_DesigIndex) 
AND
([UsedAnnualLeaves] = 
@Original_UsedAnnualLeaves) 
AND 
([UsedSickLeaves] = 
@Original_UsedSickLeaves) 
AND 
([EntryDate] = @Original_EntryDate) 

AND 
([UpdatedDate] = @Original_UpdatedDate));
 
SELECT 
EmpIndex, Password, FirstName, LastName, DesigIndex, UsedAnnualLeaves, 
UsedSickLeaves, EntryDate, UpdatedDate FROM tblEmployees WHERE (EmpIndex = 
@EmpIndex)

But those two dont work... eg.: if i chaneg the value in FirstName from John to Jon, update doesnt happen?
why this happense?
TY