C#

public void FileReplaceString(string path, string find, string replace, bool matchcase)
{
    System.IO.TextReader r = new System.IO.StreamReader(path);
    string text = r.ReadToEnd();
    r.Close();
    r.Dispose();
    text = System.Text.RegularExpressions.Regex.Replace(text, System.Text.RegularExpressions.Regex.Escape(find), replace, (matchcase)?System.Text.RegularExpressions.RegexOptions.None:System.Text.RegularExpressions.RegexOptions.IgnoreCase);
    System.IO.TextWriter w = new System.IO.StreamWriter(path);
    w.Write(text);
    w.Flush();
    w.Close();
    w.Dispose();
}

<br />
FileReplaceString(@"C:\Document.txt", "FLAT", "ZAG", false);<br />

List<Control> controls = new List<Control>();

foreach (....)
{
    Type myControlType = Type.ReflectionOnlyGetType(controltype, true, false);
    ConstructorInfo myControlContructor = myControlType.GetConstructor(Type.EmtpyTypes); // Default
    Control myControl = myControlContructor.Invoke(null);

    controls.Add(myControl);
}

// It is more efficient to declare the variables outside the loop, though.