Do you ever had the famous error message :
“Failed to enable constraints. One or more rows  contain values violating non-null, unique, or foreign-key  constraints.”
when using ADO.NET Datasets ?
Tthis is an incredibly useful message isn’t it ?
So what can you do to spare you some headaches ? Retrieve a more useful message sure !
You have to [...]

If you want to use asp.net validation system with the SharePoint’s DateTimeControl, the first thing you need to know is that this control is “just” a wrapper around simple ASP.NET controls (textbox, dropdownlist).
If you want to set the ControlToValidate property of an ASP.NET validator to the DateTimeControl’s ID, it will throw an error!
As you can [...]

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–> Pragmatic Software Development Tips

In C# you can check if a string is null or empty in many ways :

string String1 = "testString";
if (String1== null || String1 == "")
{
// …
}
else
{
// …
}

string String1 = "testString";
if (String1 == null || String1.Length==0)
{
// …
}
else
{
// …
}

string String1 = "testString";
if (string.IsNullOrEmpty(String1))
{
// …
}
[...]

Use the Stopwatch object !

using System.Diagnostics;

// …

Stopwatch myStopWatch = Stopwatch.StartNew();

// some code

myStopWatch.Stop();

Console.WriteLine("{0} ms – {1} ticks", myStopWatch.Elapsed.TotalMilliseconds, myStopWatch.ElapsedTicks);

// …