asp.net WinForm under ComboBox setting SelectedValue

using System;
Using System.Collections.Generic;
Using System.ComponentModel;
Using System.Data;
Using System.Drawing;
Using System.Text;
Using System.Windows.Forms;

Namespace Winformcombobox
{
public partial class Frmmain:form
{
Public Frmmain ()
{
InitializeComponent ();
}
#region Members
Arealists AC;
Public arealists Gettestarea ()
{
Arealists al = new Arealists ();
for (int i = 1; i < i++)
{
Area A = new Area ();
a.area_id = i.ToString ();
A.area_name = "First" + i.tostring () + "name";
Al.add (a);
}
Return al;
}

#endregion

#region Events
private void Frmmain_load (object sender, EventArgs e)
{
AC = Gettestarea ();
Cblist.datasource = AC;
Cblist.displaymember = "Area_name";
Cblist.valuemember = "area_id";
}
private void Btnsetcombobox_click (object sender, EventArgs e)
{
Setvalue0 ();
Setvaluebyvalue ();
Setvaluebyitem ();
Setvaluebytext ();

}
#endregion

#region Methods

private void Setvalue0 ()
{
Area A = new Area ();
a.area_id = "8";
A.area_name = "8th place";

            Cblist.datasource = Gettestarea ();
            cblist.displaymember = "Area_name";
            cblist.valuemember = "area_id";
            cblist.selectedvalue = a.area_id;
            Lbresult.text = Cblist.selectedvalue.tostring ();
       }

private void Setvaluebyvalue ()
{
Area A = new Area ();
a.area_id = "8";
A.area_name = "8th place";

Cblist.selectedvalue = a.area_id;
Lbresult.text = Cblist.selectedvalue.gettype (). ToString () + ":" + cblist.selectedvalue.tostring ();
}

private void Setvaluebyitem ()
{
Area A = new Area ();
a.area_id = "8";
A.area_name = "8th place";

Cblist.selecteditem = Ac.findall (delegate (area ar) {return ar.area_id = = a.area_id;}) [0];
Lbresult.text = Cblist.selecteditem.gettype (). ToString () + ":" + cblist.selectedvalue.tostring ();
}

private void Setvaluebytext ()
{
Area A = new Area ();
a.area_id = "8";
A.area_name = "8th place";

Cblist.selectedindex = cblist.findstring (a.area_name);
Lbresult.text = Cblist.selectedvalue.gettype (). ToString () + ":" + cblist.selectedvalue.tostring ();
}
#endregion
}
}

using System;
Using System.Collections.Generic;
Using System.Text;

Namespace Winformcombobox
{
    #region area
    public class area
& nbsp;   {
        private string m_area_id;
         public string area_id
        {
             get {return m_area_id;}
            set {m_area_id = value;}
       }

        private String m_area_name;
        public string Area_name
         {
            get {m_area_name;}
            set {m_area_name = value;}
       }
        private Double m_area_order;
        public double area_order
         {
            get {m_area_order;}
            set {m_area_order = value;}
       }
   }
    #endregion

    [Serializable]
    public class Arealists:list<area>
     {
        private int _maxitems = 0;
     & nbsp;  public int Maxitems {get {return this._maxitems;} set {this._maxitems = value;}}
   }
}