C#

foreach (Type type in assembly.GetTypes()) {
    if (type.IsSubclassOf(typeof(Control))) {
        // This is a control
    }
}

System.Windows.Forms.Application+MarshalingControl
System.Windows.Forms.Application+ParkingWindow
System.Windows.Forms.AxHost
System.Windows.Forms.UpDownBase
System.Windows.Forms.UpDownBase+UpDownEdit
System.Windows.Forms.UpDownBase+UpDownButtons
System.Windows.Forms.DomainUpDown
System.Windows.Forms.PropertyGrid+SnappableControl
System.Windows.Forms.SendKeys+SKWindow
System.Windows.Forms.StatusStrip+RightToLeftLayoutGrip
System.Windows.Forms.ToolStripComboBox+ToolStripComboBoxControl
System.Windows.Forms.ToolStripOverflow
System.Windows.Forms.ToolStripPanel+FeedbackRectangle+FeedbackDropDown
System.Windows.Forms.ToolStripScrollButton+StickyLabel
System.Windows.Forms.ToolStripTextBox+ToolStripTextBoxControl
System.Windows.Forms.PrintControllerWithStatusDialog+StatusDialog

foreach (Type type in assembly.GetTypes()) {
    if (type.IsSubclassOf(typeof(Control)) &&
        type.IsPublic &&
        !type.IsAbstract) {
        // This is a control type
    }
}

string searchPattern = "#";
foreach(string line in lines)
{
   if(line.Equals(searchPattern))
   {
      //you got a match. Do something with it.
   }
   else
   {
      //do something if the line doesn't match.
   }
}

foreach (String line in lines) {
    if (line.StartsWith("#")) {
        // This line starts with "#"
    }
}

Int32 lineNumber = 0;
foreach (String line in lines) {
    lineNumber++;
    // ...
}

for (Int32 i = 0; i < lines.Length; i++) {
    String line = lines[i];
    Int32 lineNumber = i + 1;
    // ...
}