aush

public class MyNumeric<T> where T : struct, IComparable<T>, IEquatable<T>, IConvertible
{
  public static readonly T MaxValue = ReadStaticField("MaxValue");
  public static readonly T MinValue = ReadStaticField("MinValue");

  private static T ReadStaticField(string name)
  {
    FieldInfo field = typeof(T).GetField(name, BindingFlags.Public | BindingFlags.Static);
    if (field == null)
    {
      throw new InvalidOperationException("Нечисловой тип: " + typeof(T).Name);
    }
    return (T)field.GetValue(null);
  }
}

Console.WriteLine(MyNumeric<int>.MaxValue);
Console.WriteLine(MyNumeric<float>.MinValue);

var xml = XDocument.Parse(
@"<?xml version='1.0' encoding='utf-8'?>
<!-- This is a SCORM 1.2 manifest file, created 9/1/2014 1:52:58 PM by semina using CourseLab 140211 -->
<manifest xmlns='http://www.imsproject.org/xsd/imscp_rootv1p1p2' xmlns:adlcp='http://www.adlnet.org/xsd/adlcp_rootv1p2' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation=' http://www.imsproject.org/xsd/imscp_rootv1p1p2 imscp_rootv1p1p2.xsd http://www.adlnet.org/xsd/adlcp_rootv1p2 adlcp_rootv1p2.xsd' identifier='MANIFEST-5D060C55_4EC0_4E49_8D2F_F5C934FFEDAD' version='1.0'>
  <title>Технолог подсистемы САДД БР. Работа с модулем «Справочники»</title>
  <item identifier='im_1' identifierref='RES1' parameters='?width=1152&amp;height=920'>
    <title>Информационный материал</title>
  </item>
  <item identifier='im_1' identifierref='RES1' parameters='?width=1152&amp;height=920'>
    <title>Информационный материал</title>
  </item>
</manifest>");

var ns = xml.Root.GetDefaultNamespace();

foreach (var element in xml.Root.Descendants().Where(e => e.Name == ns + "item"))
{
    var last = element.Elements().Last();
    if (last.Name == ns + "title")
    {
        last.AddAfterSelf(
            new XElement("track", 
                new XAttribute("id", ""), 
                new XAttribute("genre", "Break Beat")));
    }
}

private void AddTag(bool onstart)
{
    if (tagList.InvokeRequired)
        tagList.Invoke(new Action(() => BlockUI(onstart)));
    else
        BlockUI(onstart);
}

private void button1_Click(object sender, System.EventArgs e)
{
	var t = new Thread(new ThreadStart(() =>
	{
		if (button3.InvokeRequired)
		{
			button3.Invoke(new Action(() =>
			{
				button1.Text = "new button1 name";
				button2.Text = "new button2 name";
				button3.Text = "new button3 name";
			}));
		}
		else
		{
			button1.Text = "new button1 name";
			button2.Text = "new button2 name";
			button3.Text = "new button3 name";
		}                
	}));
	t.Start();
}

private void button1_Click(object sender, System.EventArgs e)
{
	var t = new Thread(new ThreadStart(() =>
	{
		if (InvokeRequired)
		{
			Invoke(new Action(() =>
			{
				button1.Text = "new button1 name";
				button2.Text = "new button2 name";
				button3.Text = "new button3 name";
			}));
		}
		else
		{
			button1.Text = "new button1 name";
			button2.Text = "new button2 name";
			button3.Text = "new button3 name";
		}                
	}));
	t.Start();
}

dynamic myDinamic = GetDynamic();
myDynamic.SomeMethod();