Dynamic Checkbox in gridview lose state after post back

Here is my code:

SqlDataAdapter adp2 = new SqlDataAdapter("select * FROM SOMETHING_MST", obj.con);
adp2.Fill(dt);
TemplateField lname = new TemplateField();
lname.HeaderText = "BANK NAME";
lname.ItemTemplate = new AddTemplateToGridView(ListItemType.Item, "NAME", dt2);
GridView1.Columns.Add(lname);

GridView1.DataSource = dt;
GridView1.DataBind();

//CODE FOR DYNAMIC CHECKBOX //

public class AddTemplateToGridView : ITemplate
{
ListItemType _type;
string _colName;
DataTable dt2;
public AddTemplateToGridView(ListItemType type, string colname,DataTable dt)
{
_type = type;

_colName = colname;
dt2 = dt;

}
void ITemplate.InstantiateIn(System.Web.UI.Control container)
{

switch (_type)
{
case ListItemType.Item:

CheckBox ddl = new CheckBox();




// chk.DataBinding += new EventHandler(ht_DataBinding);
container.Controls.Add(ddl);

break;
}

}

}
i have got code to assign id to each check box but now everything ruined...

finally...i got the solution in c# itself..thanks for suggesting this idea, Karthik..