Detect When Network Goes Up or Down

namespace My
{
 internal partial class MyApplication
 {
  private void MyApplication_NetworkAvailabilityChanged(object sender, Microsoft.VisualBasic.Devices.NetworkAvailableEventArgs e)
  {
   if (e.IsNetworkAvailable) {
    Diagnostics.Debug.WriteLine("Network went up.");
   } else {
    Diagnostics.Debug.WriteLine("Network went down.");
   }
  }
  public MyApplication()
  {
   NetworkAvailabilityChanged += MyApplication_NetworkAvailabilityChanged;
  }
 }
}

Difference Between Dates/Times Including Daylight Savings Time

System.DateTime StartTime = DateTime.SpecifyKind(3/8/2009 1:59:00 AM, DateTimeKind.Local);
System.DateTime EndTime = DateTime.SpecifyKind(3/8/2009 3:01:00 AM, DateTimeKind.Local);
TimeSpan TimeDifference = EndTime.ToUniversalTime - StartTime.ToUniversalTime;
ulong MinutesBetweenTimes = DateDiff(DateInterval.Minute, StartTime.ToUniversalTime, EndTime.ToUniversalTime);

Force the program to pause

[] Paws = new[];
public void Paws(ulong Milliseconds)
{
 System.DateTime WaitUntil = Now + new TimeSpan(0, 0, 0, 0, Milliseconds);
 while (Now < WaitUntil) {
  Threading.Thread.Sleep(18);
  Application.DoEvents();
 }
}

Alphabetize drop down list and remove duplicate items.

protected void AlphabetizeDropDownListAndRemoveDuplicates(DropDownList ThisDropDownList)
{
 SortedList AlphabetizedItems = new SortedList();
 foreach (ListItem ThisListItem in ThisDropDownList.Items) {
  if (AlphabetizedItems.Contains(System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(Strings.Trim(ThisListItem.Text))) == false) {
   AlphabetizedItems.Add(System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(Strings.Trim(ThisListItem.Text)), ThisListItem.Value);
  }
 }
 ThisDropDownList.Items.Clear();
 foreach (DictionaryEntry AlphabetizedItem in AlphabetizedItems) {
  ThisDropDownList.Items.Add(new ListItem(AlphabetizedItem.Key, AlphabetizedItem.Value));
 }
}

Create a table of unique cells from a column in a table.

Data.DataTable UniqueTable = DataTable1.DefaultView.ToTable(true, new string[] { "FieldName" });

Display row numbers in a DataGridView

{
 if (DataGridView1.Rows.Count > 0) {
  for (ulong r = 0; r <= DataGridView1.Rows.Count - 1; r++) {
   DataGridView1.Rows(r).HeaderCell.Value = (r + 1).ToString;
  }
 }
 DataGridView1.AutoResizeRowHeadersWidth(DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders);
}

Remove extra spaces and tabs from a string of characters.

string TextWithExtraSpaces = "The    Quick   Brown   Fox    Jumps    Over          A           Lazy Dog.";
string TextWithExtraSpacesRemoved = System.Text.RegularExpressions.Regex.Replace(TextWithExtraSpaces, "\\s+", " ");