C#

string dec = "123";<br />
int num = int.Parse(dec);

int value = 15;
string hex = string.Format("{0:x2}", value);
Console.WriteLine(hex);
Console.ReadKey();

Form1 frm = new Form1();
frm.TopLevel = false;
splitContainer.Panel1.Controls.Add(frm);

DeepOceans wrote:

.avi but for transmission it is 2much heavy.

public class MyClass
{
  private string _field1;
  private string _field2;
  private List<string> _field3 = new List<string>();
  public string Field1
  {
    get { return _field1; }
    set { _field1 = value; }
  }
  public string Field2
  {
    get { return _field2; }
    set { _field2 = value; }
  }
  public List<string> Field3
  {
    get { return _field3; }
    set { _field3 = value; }
  }
}

... private List<MyClass> list = new List<MyClass>();

public void Add(MyClass item)
{
  list.Add(item);
}