How to solve CS0433 compile error?

Issue: 
I got the CS0433 compile error when I tried to run my web application project, error occurred due to the user control I have.

The error message:
Compiler Error Message: CS0433: The type 'usercontrolname' exists in both 'c:\Users\username\AppData\Local\Temp\Temporary ASP.NET Files\root\f331a27e\ffbf5479\App_Web_udkg0wsp.dll' and 'c:\Users\username\AppData\Local\Temp\Temporary ASP.NET Files\root\f331a27e\ffbf5479\App_Web_hqhnzr3p.dll'

I encountered this error before, and my solution was to delete the files in temp folder manually. I was thinking if there's another better solution for this. Finally, I've found the solution.

Solution:
Just set the batch="false" attribute on the compilation section in web.config.

   <system.web>
       <compilation debug="false" batch="false"></compilation>
   </system.web>

</configuration>

This tells ASP.NET to dynamically compile individual .aspx/.ascx files into separate assemblies. This avoids the circular reference issue that triggers the exception.

I got this solution from here.

Error installing NuGet

Issue:
I was trying to install NuGet, and I got this error.

Then I realized that I have installed NuGet before. When I tried to click on the "Update" button for the NuGet, I got the same error too.
After doing some research, finally I have found this is a known issue, and it's documented in NuGet  docs.
I just installed the Visual Studio 2010 SP1 hotfix and the problem is solved!

Just go here to solve the problem - Known issues with NuGet.

Hide all buttons in listview

I was looking for how I can hide all buttons in listview, by calling a function, without needing to populate data to the listview again (not using the ItemDataBound event).

Here's the solution I've found, it's so simple!


private void ShowButtons(bool show)
{
        foreach (ListViewItem item in lvwQuotations.Items)
        {
            ((Button)item.FindControl("btnView")).Visible = show;
        }
}

First calling SELECT statement in mySql

It may be simple, but I did not know the syntax of doing so, hence I have also spent some time to get this done. Well, finally it works!

ArrayList parameters = new ArrayList();
parameters.Add(new OdbcParameter("?Email", email));
parameters.Add(new OdbcParameter("?Password", password));
string sql = "SELECT * FROM Members WHERE Email=? and Password=?";

First attempt to connect to mySql database with ASP.NET

After a few day researching and trying, finally I've successfully connect to mySql database with ASP.NET.
I really gotta write down how to do so, otherwise I'll surely forget the steps even in near future.

I have WAMP server installed, (learn how to set up WAMP server here) at first I was working with the mysql already installed with WAMP.
I tried to connect to the database, but failed to do so, I always got "ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified" when I was trying to call Connection.Open().
I have been searching around, but couldn't find the solution yet, and I suspected it was something wrong with my mysql setting, then I decided to install mysql separately.

These are how it helped me to work:

1. First, I downloaded MySQL Community Server 5.5.29, the latest version, zip edition, but I couldn't understand how it worked.
Then I clicked on "Looking for previous GA versions?", downloaded & installed MySQL Community Server 5.1.67.
I just revisited the page now, and now only I found there is a recommended download - MySQL Installer 5.5 for Windows (All MySQL Products - including MySQL server, connectors, Workbench, etc), perhaps I should get this.

2. Then, I got the MySQL Workbench, which is a GUI tool, to help me easily work with the database.
After setting all these, I still get the "Data source name not found" error.

3.Finally, I found this - Setting up MySQL for use through ODBC. This really saved me! And I managed to connect to mysql database successfully!

This is the connection string I use:

DRIVER={MySQL ODBC 5.1 Driver};SERVER=localhost;PORT=3306;DATABASE=test;UID=root;PWD=;