Compiling Monodevelop in Ubuntu using git repo from behind proxy

I did the compiling twice to get a better idea of whats going on. If you install all the prerequisite packages correctly, the compilation is pretty straightforward - you clone the git, build it, and install. Here are the steps I followed -

Prerequisites

First thing first, the prerequisites. Open up a terminal and install this packages -

sudo apt-get install mono-complete mono-devel mono-xsp4 gtk-sharp2 gnome-sharp2 gnome-desktop-sharp2 mono.addins mono-tools-devel git-core build-essential checkinstall

For the compilation to succeed you will also need to import mozilla certificates. Run the following command to import the mozilla roots -

sudo mozroots --import --sync --machine

The --machine flag is only needed if you use sudo make to compile.

Cloning the Git

Now go to the folder where you want to clone the git. Here I have used /opt. Make sure your user has right permission to that folder. You can give permission using the following command -

chmod 777 -R /opt

If permission is right, then run the git clone command-

cd /opt
git clone git://github.com/mono/monodevelop.git

if you are behind proxy use https-

git clone https://github.com/mono/monodevelop.git

This will only clone monodevelop. We need to clone the submodules using another command. But if you are behind proxy, first you need to change the git urls to use https. For that open up the file .gitmodules and replace all git with https. Make sure the url ends with .git. You can easily do it by opening the file in vi and running the following ex command -

:%s/git:/https:/g

Now clone the submodules

cd monodevelop
git submodule init
git submodule update

If you are behind proxy you need to change git url in another .gitmodule file which will be cloned in /opt/monodevelop/main/external/monomac/.gitmodules after the update.

Compile & Install

Now we will compile and install monodevelop. First we run the configure script. Here I have used the default location to install monodevelop. You can pass --prefix=<location> to install monodevelop in other location.

./configure --select --profile=stable

After this we are ready to build.

make

If you have given the --select flag, you will be asked to select the modules to make. I have skipped all them since some of the addons are broken now. For example, valabinding addon needs libvala-0.12 and mine had later version installed which is not supported. After compilation is successful, run the following command to install monodevelop.

checkinstall

This command puts the program in the package manager for easy removal later.

Misc.

Some other packages that might need to be installed are.

sudo apt-get install libglade2.0-cil-dev
sudo apt-get install libtool
sudo apt-get install autoconf

How to list DB Provider Factories registered in machine with C#

Recently I was trying to use Entity Framework with Oracle Database. In one point I needed to see the DB Provider Factories registered in my machine. In one of the blog I found how to do that using C#(Sorry I forgot to save the link). What they did was create a desktop application and used a datagrid to show the result. It looked like a lot of work to just get the names. So, instead, I used LINQPad. Basically, it's like a Sql IDE which can execute C# codes on the fly. So you can just open up LINQPad, write some code, and see the result on the fly. I even use it to get some scripting jobs done instead of using powershell or cmd.
To get the list just fire up LINQPad. Select "C# Statement(s)" from "Language" dropdownlist. Paste the following line in textarea and run.

System.Data.Common.DbProviderFactories.GetFactoryClasses().Dump();

You will be presented with the details of all DB Provider Factories in your machine.

Installing VoraX (A vim based Oracle IDE) on Windows

I am quite a fan of Vim and use it everyday. So it's natural that I was drawn to VoraX. I installed using the following procedure, but got stuck when connecting to the database. The error is related to Broken Pipe during connection. So if anyone has a solution for that please let me know. I will update this blog post if I find the solution.
The things we need for vorax to be installed are -

1. Oracle Sql Client
2. Gvim 7.4
3. Ruby
4. Ruby Dev Tools
5. And last, vorax itself

Lets start with Oracle Client. Vorax uses sqlplus to connect to Oracle database. So it needs to be installed and it's path added in Environment Path. I already had it installed in my machine and no further configuration was needed for it.
Next up, Gvim. Just download gvim from it's official website and install it. But the problem with that is gvim requires msvcrt-ruby192.dll. But I was unable to find a windows ruby installer that contained this specific version of the dll. So I downloaded custom gvim build from wyw.dcweb.cn which uses msvcrt-ruby200.dll. I found this link in this stackoverflow discussion. After downloading the custom build I replaced the original gvim74.exe and vim74.exe with the custom ones.
Now, it's time to install ruby. Downloaded Ruby 2.0.0-p594 and extract it in a local directory. Lets call it RUBY_DIR. Now put RUBY_DIR\bin in Environment Path.
After this we need to set up Ruby Dev Tools. Download it and extract to some local path. Let's call it's location DEV_DIR. Now open cmd and goto DEV_DIR. Execute the following command -

DEV_DIR>ruby dk.rb init

This will create a file named config.yml in DEV_DIR. Open the file with notepad and insert the RUBY_DIR location at the end of it if the line already doesn't exist and save it. Now run the following command -

ruby dk.rb install

This will install devkit.rb file in RUBY_DIR\lib\ruby\site_ruby.
Now lets start installing VoraX. First we install some ruby gems required by VoraX. For that Open a cmd and goto RUBY_DIR\bin. Now it's time to install some gems required by VoraX. Execute the following command in cmd -

RUBY_DIR\bin>gem install vorax --no-rdoc --no-ri

If you are behind a proxy set up HTTP_PROXY variable first -

set HTTP_PROXY=http://<proxy address or IP>:port

Now download vorax plugin and extract it's contents in %userprofile%\vimfiles. Make sure %userprofile%\_vimrc file contains the line "filetype plugin on".
Now when you run gvim with vorax installed. Further information can be found

1. vorax.txt file in downloaded plugins doc folder
2. https://github.com/oneclick/rubyinstaller/wiki

Why Html.BeginForm Have to be used with using?

This is the exact question I typed in google to find the answer. I guess I was too lazy to find it myself. But alas, I didn't find any good links. So I started going through the MVC library myself.
My exact question is that why we need to declare Html.BeginForm with using like below but for other Html extensions we don't.

@using(Html.BeginForm())
{
...
}

Well, the answer is actually pretty simple. The BeginForm method render a html form tag. When the method is called it render only the first part of the form.

<form action=""...>

After that any number of extension methods can be called. So how would the system know when to close the form. And that's why using is used. When system goes out of the using scope, it tries to dispose the enclosing object. This is when the object renders the closing form tag.
This can be verified by going to the declaration of BeginForm. All the BeginForm methods return an object of Type System.Web.Mvc.Html.MvcForm. And MvcForm implements IDisposable interface.

How to add software source in ubuntu from behind proxy

The easiest way to add new software source to ubuntu is using the apt-add-repository command from terminal.

apt-add-repository ppa:user/repository

However, recently when I tried to add a ppa using the above mentioned command from behind proxy, it didn't work. So I had follow a longer way to add the software source.
First goto launchpad.net and search for the software whose source you want to add. Then click on the Technical details about this PPA link, which will show you source.list entries. Select you ubuntu version from the dropdownlist/combobox. Then copy the first line. Picture shown below -

Now you can add this copied source to your ubuntu software sources in two ways. One way is to run the following command from you terminal -

apt-add-repository 'deb http://myserver/path/to/repo stable myrepo'

Or you can just use the gui. For that open up

Ubuntu Software Center

and goto Edit>Software Sources...>Other Sources and clicking the add button. Paste the link on the textbox and click Add Source.
This will only add the source to your ubuntu. But for ubuntu to trust the source you need to add the gpg key of that source. For that you need to first save the key to you machine. Click on the Signing Key link shown in first picture. Then click on the first link on the next page. This will show you some text. Now from that page copy only the part shown below -

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.1.4
Comment: Hostname: keyserver.ubuntu.com

mI0ETnBj5QEEAOOa9QvcobiU9ulHUlwX/MOzhA2aH52zQ4kIk58PBk+5wM1gjLMUEhXAjJu7
0pQLsm2Te7q25ljYyV6LAN0f0FaFA1fx9P9oQF5dS208Gb5S4b434GieMmgAOC8Tidq
s8c8zTsaufaRaqPrZEGgj9q/dQb88mua5cM9DswHABEBAAG0I0xhdW5jaHBhZCBQUEEgZm9y
IEViZXJoYXJkIEJlaWxoYXJ6wECACIFAk5wY+UCGwMGCwkIBwMCBhUIAgkKCwQWAgMB
Ah4BAheAAAoJEEi2gD6Dnsu+AlIEAIbeU2/crDbYp/wRrpBsvBw44UtIKHYsRXLESWF2+kYk
8jQBfjnRUxoC3PFaoMlWaWJh7Jv5MWkSb0aws9DaRzFVcNu6/SDoj7t2/mXLgnDMQryw9CkL
gYcUcNlWvrgKicgqo9/v2L2FH2393i9blMJz7216j28NGjgoKeOLTWdv
=viCD
-----END PGP PUBLIC KEY BLOCK-----

Now create a text file and save this text with any name in you machine. Again you can do it two ways. First on goto the saved file location from terminal and run the below command -

sudo apt-key add <file>

Or second way, goto the Software Sources window as mentioned above. Then goto the Authentication tab, click on Import Key File.. button and browse and select the save file. This will add the signing key of the source to your ubuntu.
Now all that's left is to update you package repository with sudo apt-get update and you are ready to install any software from the new source you added.

My Most Used Vim Commands

I have become fond of Vi/Vim in recent years. For most of my typing works I prefer to use Vim. Well editors which provide vim emulation. So I thought why not share the vim commands that I use most.
Lets start with the basics :).

Moving arround:

Command	Description
h	move the cursor left
j	move the cursor down
k	move the cursor up
l	move the cursor right

Moving arround (advance):

And some advance command for moving arround..

Command	Description	Remarks
w	move cursor to the next word	W does the same but considers special characters part of word
b	Same as w, but works backwords	B is same as W, but works backwords
e	Same as w, but cursor moves to the end of word	Same as W, but cursor moves to the end of word
%	Go to the matching bracket
(	Goto start of sentence
)	Goto end of sentence
^	Goto first printable character of the line
0	Goto start of the line
$	Goto end of the line
H	Move cursor to the first viewable line
L	Move cursor to the last viewable line
zz	Move window such that the cursor comes to the middle of the screen

Manipulating Text:

Command	Description	Remarks
u	Undo last action
x	delete character under cursor
dw	delete one word	can be used with other movement commands
dd	delete whole line
I	Goto start of the first printable character on the line and switch to insert mode
a	Switch to insert mode after the character under cursor
A	Goto end of line and switch to insert mode
o	insert line below current line and goto insert mode
O	insert line above current line and goto insert mode
y	Copy/yank character under cursor	yy copies current line
p	paste copied text
~	change letter case
v	turn on selection mode	you can use movement commands to selecte texts in visual mode

Searching

Command	Description	Remarks
/	searches the following text starting from the cursor and forward	type the text to be searched after the / and press enter
n	goto the next occurence of the searched text
N	goto the previsou occurence of the searched text

Miscelleneous:

Command	Description
zo	Open folded lines
zc	fold the foldable region the cursor is currently in

Ex Commands

Now some ex commands. (These commands are given using :) -

Command	Description
:w	save file
:q	quit vim
:%sort	sort all lines in the files lexicographically
:nohl	turn off highlighing of searched items
:syntax on	turn on syntax highlighting
:set ft=<filetype>	sets filetype of the file for syntax highlighting
:set wrap	turns on wrapping of lines
:set nowrap	turns off wrapping of lines

Phew... the list got bigger than I expected. And these are only the ones I use in my regular vim activity. Furthermore, I consider myselft just a novice of vim :p.

How to upgrade kernel on Ubuntu

You can find out which kernel version you are running by opening up a terminal and running the following command:

uname -r

To find out which version is the latest go to www.kernel.org.
To install the latest version you need to download the images. For that go to kernel.ubuntu.com/~kernel-ppa/mainline and open up the folder that matches the version number you found in www.kernel.org.
You need to download three files from the list. For 32 bit they are -

linux-headers-***-generic_***_i386.deb
linux-headers-***_***_all.deb
linux-image-***-generic_***_i386.deb

For 64 bit they are -

linux-headers-***-generic_***_amd64.deb
linux-headers-***_***_all.deb
linux-image-***-generic_***_amd64.deb

After downloading the files copy them to a temporary folder with no other deb files and run the following command from terminal -

sudo dpkg -i *.deb

This will install the new kernel. Restart you machine and uname -r to confirm you are running the latest kernel.
To uninstall the old kernel you could just use ubuntu-tweak. Install it with -

sudo apt-get install ubuntu-tweak

After installing ubuntu tweak, run it and open janitor. Do a clean and it will uninstall the old kernel for you.

Cannot launch/debug ASP.NET/ASP.NET MVC on MonoDevelop on Ubuntu 14.x

If you have installed Monodevelop 5.1 from ermshiperete's PPA then you might be facing this problem. When you try to run the project MonoDevelop will say it can't find xsp4.
The problem is that the PPA provides local mono but does not provide mono-xsp4 because of compatibility issues. So first we need to install mono-xsp4

sudo apt-get install mono-xsp4

Then we need to tell MonoDevelop to use User's mono runtime instead of the local one to run the project. For that we need to goto Edit>Preferences.. from MonoDevelop menu and select Mono*** (/usr) and set it as default.

Now if you try to run the project, it will run but you will get an error page saying System.MissingMethodException: Method not found: 'System.Configuration.IConfigurationSectionHandler.Create'. The problem is that mono-xsp4 cannot locate some dll files when run from MonoDevelop probably because the launcher script /opt/monodevelop/bin/monodevelop-launcher.sh set some environment variables before starting MonoDevelop.
To get around it we need to run MonoDevelop itself with the users mono runtime. You can see in the above picture that even though we have set users runtime as default, monodevelop was using the local mono to run itself. So, lets run monodevelop with users mono runtime. First copy the monodevelop script that monodevelop-launcher.sh calls to run monodevelop to someplace with easier access.

cp /opt/monodevelop/bin/monodevelop ~/Desktop/monodevelop

Now modify the value of EXE_PATH to directly point to MonoDevelop.exe

EXE_PATH=/opt/monodevelop/lib/monodevelop/bin/MonoDevelop.exe

Save the file.
Now run monodevelop script from desktop and monodevelop will start using users mono.

./monodevelop

If you try to run web application now xsp4 will successfully run them and you can also debug them. I have tested it with ASP.NET MVC 2 Project. You can also verify that monodevelop is using users mono runtime by going to the above mentioned screen.
P.S. If any registry access error is shown then we need to create the following directories and set their permissions.

sudo mkdir /etc/mono/registry
sudo mkdir /etc/mono/registry/LocalMachine
sudo chmod g+rwx /etc/mono/registry
sudo chmod g+rwx /etc/mono/registry/LocalMachine