Gridview Editing for Binded Dropdownlist

Hi this is saritha,

iam having a gridview, when i click edit button iam not able to retreive the value in Binded dropdownlist,

my code is

dr = ds.Tables[0].Rows[0];
TxtModelName.Text = dr[0].ToString();
TxtStreet.Text = dr[1].ToString();


ListItem li = DdlCountry.Items.FindByText(dr[2].ToString());
if (li != null)
{
li.Selected = true;
}

ListItem li1 = DdlState.Items.FindByText(dr[3].ToString());
if (li1 != null)
{
li1.Selected = true;
}

ListItem li2 = DdlCity.Items.FindByText(dr[4].ToString());
if (li2 != null)
{
li2.Selected = true;
}
//DdlState.Text = dr[3].ToString();
//DdlCity.Text = dr[4].ToString();
TxtPincode.Text = dr[5].ToString();
TxtPhoneno1.Text = dr[6].ToString();
TxtPhoneno2.Text = dr[7].ToString();