how to bind data with dropdownlist using cache

Hi,what is the code to bind the dropdownlist using Cache Memory.


try
{
objadminfields.Flag = "IS";
ds = objadminfields.state();

{
ddlstate.DataSource = ds.Tables[0];
ddlstate.DataTextField = "StateName";
ddlstate.DataValueField = "StateId";
ddlstate.DataBind();
}
ddlstate.Items.Insert(0, "----Select State----");
}
catch (Exception ex)
{
LblState.Text = ex.Message;
}


How to bind the dropdownlist using state management(cache)

in this case what is the use of cache


Thanks InAdvance,
T.Madhuri.