DIV Layout with CSS (Table vs. DIV Layout)

Here is a nice article explaining the differences between HTML table and DIV based layouts. It gives examples of each and how to move forward with DIV based layouts.

http://www.devarticles.com/c/a/Web-Style-Sheets/DIV-Based-Layout-with-CSS/

Add User Controls to an ASP.NET page

Heres an artircle on how to add a user control to an ASP.NET page, its quite informitive and details all of the necessary steps

http://msdn.microsoft.com/en-us/library/5d0t5fak(VS.71).aspx

onclick vs. onmousedown and onmouseup

I've been trying for the last couple of hours as to why I couldn't select a row in my GridView using right click... it seemed to work fine for left click, but right click had issues (I had my attribute for the row set to 'onclick')

What I was doing so making a context menu appear, but I wanted the row to select itself before the menu appeared. After many vain attempts of simulating left click behaviour, adding pointers to the left clicks behaviour into the code... I simply changed the attribute to onmouseup, and presto! it works!

strange, but I do recall when attemping to disable right clicks on webpages, the onmousedown/up event is captured, so it must be how the browser interprets the keypresses for each.

WPF - StaticResource vs. DynamicResource

Static resources are resolved at compile time, whereas dynamic resources are resolved at runtime.

Use DynamicResources when the value of the resource could change during the lifetime of the Application.

Use StaticResources when it’s clear that you don’t need your resource re-evaluated when fetching it – static resources perform better than dynamic resources.

ASP.NET - VIEWASTEXT Attribute

If you have a control on an ASP.NET page and Visual Studio is having trouble rendering it in design view, then you can add the VIEWASTEXT attribute to the tag, and visual studio will then render this as text.

Example:

<object id=factory style="display:none"

classid="clsid:1663ed61-23eb-11d2-b92f-008048fdd814"

  codebase="smsx.cab#Version=6,5,439,30 VIEWASTEXT>

    <param name="template" value="MeadCo://IE7" />

</object>

Error MSB4019: The imported project "C:\Microsoft.CSharp.targets" was not found.

If you've received this error, it usually means that the targets file can not be found/identified by the current versiuon of visual studio....

I usually receive this error when attempting to import a .NET 3.5 project into a .NET 2.0 solution.

To tackle this particular scenario, you will need to open the project file (.csproj).... and if you wish to make the project .NET 2.0 ready, you will need to find the following line (specific to 3.0/3.5)...

<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

and replace with...

<Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />

Visual Studio Debug Problem (Debugger Detaching)

During the development of an ASP.NET application, have you ever had the debugger randomly detach itself from the IE instance?

This is usually because VS gets confused regarding which isntance of IE to detach itself to... goto into Task Manager and see if there are any iexplore processes running that do not have a window handle. If so, end them and re-try...

If not, take a look at this post regarding new features introduced with IE8 that can cause this issue...

http://weblogs.asp.net/abdullaabdelhaq/archive/2009/06/01/VS-Debug-Problem-with-IE8.aspx

C# Conditional Operator ( ?: ) and Null-Coalescing Operator ( ?? )

Often times in code you want to assign one variable to another, but only if the variable is not null. If it is null, you want to populate the target variable with another ( perhaps default ) value. The code normally may look like this using the C# Conditional Operator:

string fileName = tempFileName !=null ? tempFileName : "Untitled;

If tempFileName is not null, fileName = tempFileName, else fileName = “Untitled“.

This can now be abbreviated as follows using the Null-Coalescing Operator:

string fileName = tempFileName ??"Untitled";

The logic is the same. If tempFileName is not null, fileName = tempFileName, else fileName = “Untitled“.

The Null-Coalescing Operator comes up a lot with nullable types, particular when converting from a nullable type to its value type:

int? count = null;

int amount = count ?? default(int);

Since count is null, amount will now be the default value of an integer type ( zero ).

These Conditional and Null-Coalescing Operators aren't the most self-describing operators :), but I do love programming in C#!

C# - Difference between 'out' and 'ref'

When passing objects as parameters to functions, there may be a certain scenario where you wish to modify a parameter before a function call, modify its valur within the function, and retain its value after the function call... This example behaviour describes the actions of the 'ref' qualifier to a function argument. 'out' however, is quite similar...

ref qualifier

When passing an object to function, specifying it as ref requires the object to be initialised beforehand. You can then modify its value inside the function and continute to use the object once the function call has ended.

Example

        private void ModifyByFive(ref int number)

        {

            number += 5;

        }

out qualifier

When passing an object to function, specifying it as out does not require the object to be initialised beforehand. However, the object can then be modified for this purpose within the function, and can be used outside the function once the function has executed. This can be treated as an 'extra return value'. However, using too many out parameters might require an architectural re-think; as a class or struct might prove more benificial.

Example

        private void ModifyByFive(out int number)

        {

            number += 5;

        }

Registering a DLL as an MSI Custom Action

1. In Visual Studio, open your solution and right click on the setup project. Select "View" and then select "Custom Actions".

2. Select a custom action for which you which to register the DLL, this would usually be "Install".

3. Right Click on the Install directory and select "Add Custom Action".

4. You will then need to add a script which will be run as part of the MSI installation process. For this, we will use VB Script. Paste the below code into Notepad and save it as a VB Script (.vbs) file.

REGISTER DLL VB Script

Dim WshShell

Set WshShell = CreateObject("Wscript.Shell")

WshShell.run "regsvr32 /s DLLFILENAME.dll"

Set WshShell = nothing

5. Add this to your project and reference it as a custom action for your "Install" process.

6. You may wish to unregister the DLL file during the uninstall phase. Perform the previous processes which the uninstall VB Script below...

UNREGISTER DLL VB Script

Dim WshShell

Set WshShell = CreateObject("Wscript.Shell")

WshShell.run "regsvr32 /u/s DLLFILENAME.dll

Set WshShell = nothing