Search This Blog

Tuesday, October 4, 2011

WebGrid Control Issues

If you are using web grid third party control in any of your applications please make sure to use it for the exact version of ASP.NET for which it was built for. Suppose if say you have a Webgrid to be used for an ASP.NET 1.1 application and if my mistake your default Website or your virtual directory has a version of ASP.NET as 2.0, then the webgrid will throw error like the datasource or memory used to access data from grid is corrupt and that is basically because the other version wp might not have access to the webgrid datasource.

Monday, September 12, 2011

Android app on windows using Eclipse

First all please go through this blog which guides developers like me who are basically .NET developers but having an interest on building Android application using windows platform.

The blog post will guide anyone on how to setup the environment and run your first app, but I want to highlight some of the issues I faced and which are quiet common and resolutions/work around those issues. First of all the 4 things that needs to be setup are

1. Java Development Kit (JDK) 6 – self-explanatory; the Java runtime and development libraries.

2. Eclipse – an IDE (integrated development environment) for Java and other languages.   If you don’t have it installed, grab the Eclipse IDE for Java Developers version, which will suit the needs of this tutorial.  The Windows download doesn’t contain an installer, so extract the ZIP in an accessible location, such as D:\eclipse.

3.Android Software Development Kit (SDK) – The heart of Android development.  This provides all of the necessary tools and libraries required to build applications for the Android platform.  Extract it to an accessible location on your hard drive and run the setup executable, which will download and install a set of components.

4.Android Development Tools (ADT) Eclipse Plugin – This plugin adds Android-specific development tools and project templates to Eclipse.  Instead of a separate download, it installs within Eclipse – you can follow the instructions here to get it installed.

ISSUE 1 At step 3, when you try to run the executable to install Android SDK, then that might give errors because it might not be able to detect the JDK. Instead of cancelling the installation, just click "Previous" button and go the previous screen and then "Next" button ,it will detect it this time for sure.

ISSUE 2 To install the ADT as in Eclipse plugin, follow the steps below to first download it as a plugin
1. Start Eclipse, then select Help > Install New Software....
2. Click Add, in the top-right corner.
3.  In the Add Repository dialog that appears, enter "ADT Plugin" for the Name and the following   4. URL for the Location:

    Click OK

    Note: If you have trouble acquiring the plugin, try using "http" in the Location URL, instead of    "https" (https is preferred for security reasons).
    In the Available Software dialog, select the checkbox next to Developer Tools and click Next.
    In the next window, you'll see a list of the tools to be downloaded. Click Next.
    Read and accept the license agreements, then click Finish.

    Note: If you get a security warning saying that the authenticity or validity of the software can't be established, click OK.
    When the installation completes, restart Eclipse.

ISSUE 3 After creating your first Android virtual device, when you try to run the application, you can get an error like 
Emulator] PANIC: Could not open: C:\Documents and Settings\UserNAme\.android/avd/Android2.2.ini
This happens because if your Android SDK location is in any other location than C drive, the eclipse tool will not be able to locate that folder .android, so the solution would to look for the folder *.android and copy it over to the location sorted by the eclipse tool. In my case, I copied the folder .android from a location in my D: drive to C:\Documents and Settings\UserNAme\.android.
ISSUE4 While launching the new emulator, you might again get an error like
 Emulator] invalid command-line parameter: Files\Android\android-sdk\tools/emulator-arm.exe.
 Emulator] Hint: use '@foo' to launch a virtual device named 'foo'.
 Emulator] please use -help for more information

To get around this issue change the SDK location path in eclipse to D:\PROGRA~1\Android\android-sdk for a 32 bit machine or change to D:\PROGRA~2\Android\android-sdkfor a 64 bit machine if your SDK installation is on D: drive or else the drive accordingly. 

This issue is because of the fact that eclipse will not be able to SDK location if SDK location contains any spaces.

Sunday, July 31, 2011

Creating a linked Server on SQL Server

EXEC sp_addlinkedserver @server='GM', @srvproduct='',
@provider='SQLOLEDB', @datasrc='databaseIP,Port',
@catalog ='DBName'
EXEC sp_addlinkedsrvlogin 'GM', 'false', NULL, 'DBUser', 'DBPassword'

--The Query, Using the Server Database you are already in and your new linked server: GM--

Thursday, July 28, 2011

Another way to Pass list of parameters to SQL Server Stored Procedures

The following are the ways you could have solved

1) Passing inputs (all Ids at once) as a comma separated string
2) Since SQL Server 2005 is CLR compliant, you could have written a dll which could have performed the above task at a better performance rate

3) But third option is passing all the inputs as XML. And XML parsing may be complex but this approach will be far more efficient. Have a look at the code below

    JOIN    @ids . nodes ( '/Root/Employee' )   AS  T ( Item )
      ON    E . EMPLOYEEID =  T . Item . value ( '@num' ,   'int' )
EXEC  SP_EMPLOYEES N '<Root><Employee num="1"/><Employee num="2"/>
                             <Employee num="3"/><Employee num="4"/></Root>'

Tuesday, July 12, 2011

Opening DTS packages on SQL Server 2005 Management Studio

For opening DTS packages on SQL Server Management for 2005 and above, you will have to install the following components
1. DTS component for Sql Server 2005 Client
2. Backward Compatibility
from the following link

The names of the MSIs will be something like this SQLSERVER2005_DTS.msi anf SQLSERVER2005_BC.msi.

When done with the above installation, please make sure that if you have multiple installations of SQL Server, in Environment variable->System Variables, the entry of SQL Server 2000 Tools should be before the latest version like below

C:\Program Files\Microsoft SQL Server\80\Tools\Binn\;
C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;

Sharepoint 2010 on Windows 7

This url has the full instructions on how to go about this.

Will try this once I am done with Windows 7 upgrade on my desktop. Also this site is helpfull

Sunday, July 3, 2011

Connecting Oracle 10g Developers Suite Forms to Oracle 10G Express

Hi, today I was trying to do a hands-on on Oracle Forms builder. I found a very nice tutorial at 

You can download the Oracle 10g Developers Suite for Free at the Oracle Site ( and also Oracle 10g Express at . The installations are pretty straight forward and its not where you will see a road block, but its when you try to connect from Form's Developer or SQL plus to the Express Instance you will have some weird issues if unknowingly your machine has some old versions of Oracle tnsnames.ora apart from the places where you have installed the new express editions and believe me its a real pain in the butt.

So you will get an error like "ORA-12154 TNS:Could not resolve the connect identifier specified" and here the things that you need to check first

1. Do a global search on your local machine for the file names "tnsnames.ora" and if you see multiple occurrences, you can be sure that is the problem. In my case, I was sure that I will not need the other tnasnames.ora files apart from the one in the location of the 10g express so I simply renamed those tnsnames.ora files to tnsnames.ora1 and sqlnet.ora (if there was one in those locations) to sqlnet.ora1.

2. In the drive where you have installed your express database ( In my case its D:\oraclexe\app\oracle\product\10.2.0\server\NETWORK\ADMIN ), you will find that by default your tnsnames.ora will have an entry like below

XE =
    (ADDRESS = (PROTOCOL = TCP)(HOST = CHIRES35510)(PORT = 1521))

Now, please change the SERVICE_NAME = XE to SID = XE like below

XE =
    (ADDRESS = (PROTOCOL = TCP)(HOST = CHIRES35510)(PORT = 1521))
      (SID = XE)
** In the first case for people who need to keep their old tnsnames.ora, please create an environment variable "TNS_ADMIN" and in my case it points to "D:\oraclexe\app\oracle\product\10.2.0\server\NETWORK\ADMIN".

Once done, please save and restart the following 2 services on windows.

PS: This blog helped me as it had similar problems discussed and I consolidated it for future references

Saturday, January 1, 2011

Custom Error Pages in ASP.NET

The default error page is a catchall for any type of error that may occur for resources managed by ASP.NET, so it has to be relatively generic. In some cases we might need to create custom error pages as the generic pages will not tell the whole story. For example, if a user attempts to access a nonexistent resource managed by ASP.NET, then the user receives a 404
error. If, however, you have only specified a default error page, then ASP.NET displays that error page without ever mentioning that the resource was not found. This makes it appear as though the resource exists and is having errors.

To avoid this we could create a 404 error page that informs the user that the page they are trying to access does not exist so they know they entered the wrong URL. We could even go as far as displaying a site map, links, or a search box to allow the user to more easily locate their desired content. Defining custom error pages requires adding an <error> inner element to the
<customErrors> element in Web.config. The following lines show an example that defines a custom error page for the 404 error.

<customErrors mode="On" defaultRedirect="~/ErrorPages/GenericError.html">
<error statusCode="404" redirect="~/ErrorPages/Error404.html"/>

The statusCode parameter of the <error> element defines the server status code for which the error page should be returned. The redirect parameter defines the actual error page location. In this example, if a 404 error occurs, ASP.NET redirects the user to the Error404.html page. Because the 404 error is the only custom error defined, any other error will cause the user to be redirected to the GenericError.html page.