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Archive for the ‘Tips and Tricks’ Category

Disable .pdb file generation in Release Mode

with 3 comments

Visual Studio 2005 – Compile Options

In Visual Studio 2005, .pdb file gets generated in Debug mode and Release mode.

In debug mode it loads the entire symbol table, in Release mode it loads the key symbols.

In Release mode, the generated .pdb can be deleted very well deleted. (Because framework does not uses it)

To disable .pdb generation in Release mode, goto

Project Properties > Compile Tab > Advanced Compile Options

Compile Options

Goto Generate Debug Info (dropdown list) and select None.

No PDB

Written by gchandra

February 22, 2008 at 9:15 pm

SQL Server 2005 : Access Tables / Entities across Servers.

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Accessing objects (tables..) across servers (SQL Server) is very simple.

Step 1: Create a link between two servers

Goto Query Window

EXEC sp_addlinkedserver
   'PRODSVR',
   N'SQL Server'
GO

‘PRODSVR’  is the name of the Server.Execute it.

Step 2: Setup Permission between Servers.In Management StudioGotoServer Object >> Linked Servers >>

PRODSVR (See Image)

Linked Servers List

Right Click on PRODSVR goto Properties and make changes as given below.

1-general.jpg

2-security.jpg

 3-securityoptions.jpg

Step 3: To access the tables in other server

Use the following  hirearchy

PRODSVR.dbname.dbo.tablename

To access Person.Address table from AdventureWorks database


Select * From PRODSVR.AdventureWorks.Person.Address

Advantages :


1. Update Production server with data from development server. (SSIS is alternate way)


2. Allow users to access production database without multiple logins. (windows authentication or SQL authentication) 



kick it on DotNetKicks.com

Written by gchandra

February 18, 2008 at 3:31 pm

SQL Server, Clean your Database Records and reset Identity Columns, The Shortest Path

with 4 comments

(Copied from Moses’s Blog for my reference)

Well, I had a small issue regarding writing a script to clean a database we have and reset its identity columns in all tables. Although the database wasn’t huge one (less than 100 tables) I had to trace relations to be able to delete child table’s records before parent’s ones because of the foreign key constraints. The solution is disable the foreign keys and delete records with no fear of any errors then enables the constraints again.
Well, I found a solution to disable all constraints without the need to go on each table and disable it manually. and I was happy to know that I can use this solution in deleting all records from all tables. Not only this I was able to use the same solution to reset identity columns in all tables.

The solution was to use this built in stored procedure sp_MSforeachtable. For help about this proc search for it in Books online or use this sp_helptext sp_MSForeachtable.

Now back to my 6 lines, bellow is how I re-zeroed my Database:


1: /*Disable Constraints & Triggers*/
2: exec sp_MSforeachtable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'
3: exec sp_MSforeachtable 'ALTER TABLE ? DISABLE TRIGGER ALL'
4:
5: /*Perform delete operation on all table for cleanup*/
6: exec sp_MSforeachtable 'DELETE ?'
7:    
8: /*Enable Constraints & Triggers again*/
9: exec sp_MSforeachtable 'ALTER TABLE ? CHECK CONSTRAINT ALL'
10: exec sp_MSforeachtable 'ALTER TABLE ? ENABLE TRIGGER ALL'
11:   
12: /*Reset Identity on tables with identity column*/
13: exec sp_MSforeachtable 'IF OBJECTPROPERTY(OBJECT_ID(''?''), ''TableHasIdentity'') = 1 BEGIN DBCC CHECKIDENT (''?'',RESEED,0) END'

Written by gchandra

February 18, 2008 at 10:23 am

Organize your SQL Server 2005 tables in a better way !!

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When you create tables in SQLServer (2005) by default its all get created under default schema. (dbo.)

If you have too many tables then the table list could be confusing / clumsy.

Here enters Schema

(see image)

Schema Example

To organize your tables into meaningful groups (or namespaces)

First create a schema

CREATE SCHEMA Person
GO

Then Alter your existing table

ALTER SCHEMA Lookup
TRANSFER dbo.Contact
GO

So now that you have grouped your tables into different schemas.

How to use them ? The usual way but with schema name added to it.

SELECT * FROM Person.Contact


What is Schema ? (from MSDN)Beginning in SQL Server 2005, each object belongs to a database schema. A database schema is a distinct namespace that is separate from a

database user.  Schemas can be created and altered in a database, and users can be granted access to a schema. A schema can be owned by any

user, and schema ownership is transferable.

In previous versions of SQL Server, database users and schemas were conceptually the same object. Beginning in SQL Server 2005, users and schemas

are separate, and schemas serve as containers of objects.

Written by gchandra

February 6, 2008 at 9:07 am

Prevent Session Timeout in Asp.net

with 17 comments

Prevent Session Timeout in Asp.net [VB]

ASP.Net 2.0 [VB]

Inspired by this article from Code Project. [Thanks Ach1lles ]


I slightly modified few things to work for VB and VS2005 environment. The code works perfect and I’m very happy with it.First I created a Module file and created this function.


Public Function KeepAlive() As String

        Dim int_MilliSecondsTimeOut As Integer = (HttpContext.Current.Session.Timeout * 60000) - 30000
        Dim sScript As New StringBuilder
        sScript.Append("<script type='text/javascript'>" & vbNewLine)
        'Number Of Reconnects
        sScript.Append("var count=0;" & vbNewLine)
        'Maximum reconnects Setting
        sScript.Append("var max = 6;" & vbNewLine)
        sScript.Append("function Reconnect(){" & vbNewLine)
        sScript.Append("count++;" & vbNewLine)
        sScript.Append("var d = new Date();" & vbNewLine)
        sScript.Append("var curr_hour = d.getHours();" & vbNewLine)
        sScript.Append("var curr_min = d.getMinutes();" & vbNewLine)
        sScript.Append("if (count < max){" & vbNewLine)
        sScript.Append("window.status = 'Refreshed ' + count.toString() + ' time(s) &#91;' + curr_hour + ':' + curr_min + '&#93;';" & vbNewLine)
        sScript.Append("var img = new Image(1,1);" & vbNewLine)
        sScript.Append("img.src = 'http://localhost/myapp/reconnect.aspx';" & vbNewLine)

        sScript.Append("}" & vbNewLine)
        sScript.Append("}" & vbNewLine)
        sScript.Append("window.setInterval('Reconnect()',")
        sScript.Append(int_MilliSecondsTimeOut.ToString() & "); //Set to length required" & vbNewLine)
        sScript.Append("</script>")

        KeepAlive = sScript.ToString
End Function

All this code does is, build a simple javascript function and its called from server side.The works like this,- Gets the current session timeout duration.
– Subtract 30 seconds from it and assign it to MilliSecondsTimeOut variable
– Create a Reconnect() javascript function
– Create a global variable with max value 6
– Get current hour and Min [just for displaying the last refresh time]
– Verify whether count is less than max value (ie 6)
– If so, change the window status with Text
– Create a dummy image and set reconnect.aspx url as its source [this way a call is made to server and it wont session timeout]Create a timer using window.setInterval and assign the MilliSecondsTimeOut value.
[this way this function is called 30 seconds before session timeout]Tha max value (6) can be set to any number. If its 6 then this session timeout is avoided 5 times.

Default session timeout is 20min. 20 * 5 = 100 mins. Which is good for non-secure page.

Then

On the pages where I want to prevent Session Timeout I entered this line.


Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Try
  'dont forget to add this line 
  Page.ClientScript.RegisterClientScriptBlock(Me.GetType, "reconn key", KeepAlive())
 
 If Not Page.IsPostBack Then
 ---
 ---
 ---
 End If

Catch eX as Exception
 '----
End Try
End Sub

Created reconnect.aspx in Visual Studio and deleted the .vb and .designer.vb files.This is the final version of reconnect.aspx


<%@ Page Language="vb" AutoEventWireup="false"%>
<%@ OutputCache Location="None" VaryByParam="None" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "<a href="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" mce_href="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd</a>">
<html xmlns="<a href="http://www.w3.org/1999/xhtml" mce_href="http://www.w3.org/1999/xhtml">http://www.w3.org/1999/xhtml</a>" >
</html>

Note : When you compile the project sometimes, VS2005 complains reconnect.aspx is not in right format.
So I EXCLUDED this file from my project. Now VS 2005 will compile without complaining and the logic will also work.- Happy Programming

Written by gchandra

November 26, 2007 at 3:42 pm

How strong User ID and Password should be ?

with 3 comments

Few thoughts on how to  enforce strong userids and passwords.

UserIDs can be email address. (An email can be sent to the ID with a link to make sure email id is valid)

– Password must be between 8 and 14 characters.
– Password must contain at least one number, at least one English uppercase character, and at least one English lowercase character.
– Password must contain one special character like #,*,&
– Password may not have more than two consecutive identical characters.

Ex : This is valid :  grEen12#   but  grEEEn12# is not valid

– Password cannot be the same as your previous three passwords.

– Password cannot be similar as your previous three passwords.

Ex : If this is your old password grEen12#, new Password cannot be grEen13#

– Password cannot be the same as or contain your User ID or contain the word “password” or contain your site / company name.

Ex : If your site is abcjewellers then password cannot be   aBcJewellers#1 or paSSword$1

– Password should expire every 60 days.

Written by gchandra

October 15, 2007 at 11:07 am

Posted in Tips and Tricks

Tagged with , ,

Comment on Server Side Asp.Net

with 2 comments

Inspired by ASP.NET 2.0 Server Side Comments

If you want to comment a particular column in GridView, HTML commenting approach wont work.

You have to use

<%--

--%>

example:

<asp:GridView ID="gvSample" runat="server" AutoGenerateColumns="False"
GridLines="None" CellPadding="0" CellSpacing="0">
<Columns>
<asp:BoundField DataField="Column1" ItemStyle-Width="25px" />
<asp:BoundField DataField="Column2" ItemStyle-Width="15px" />
<asp:BoundField DataField="Column3" ItemStyle-Width="15px" />

<%-- Commented Column --%>
&lt;%-- <asp:BoundField DataField="Column4" ItemStyle-Width="15px" />--%>

</Columns>
</asp:GridView>

Written by gchandra

October 2, 2007 at 9:53 am