threw an exception of type 'Microsoft.VisualStudio.Debugger.Runtime.CrossThreadMessagingException'

solution:

textBox1.Invoke(       new MethodInvoker(           delegate { textBox1.AppendText("."); }));

Although you already have VS2008 SP1 installed.

Fix:

start -> run -> "cmd"

Setup /ACTION=install /SkipRules=VSShellInstalledRule

you will still get an error but it installs fine.

The SQL Server 2008 installer is checking the HKLM\SOFTWARE\Microsoft\DevDiv\XXX\Servicing\9.0\SP reg keys to tell if SP1 is installed. If you inspect those keys and find any SP keys with the value “0,” that is your road block.

Best way to do it is as follows:

create function dbo.throwError()
returns nvarchar(max)
as
begin
    return cast('Error here.' as int);
end

and it will throw the following error:

Msg 245, Level 16, State 1, Line 1
Conversion failed when converting the varchar value 'Error here.' to data type int.