DropDownList Bind

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C#3.0

C#

hi everyone.

I Have problem.i have a grid view in which i have put dropdown list.now i want to add the items to one of the drpdwnlist at the selected index change of other one.my problem is that i m nt getting that particular dropdownlist
at the selected index change of first dropdownlist ..can any have idea plz help i m very confused.I have Binded It .But There Is Another Problem Take a Look At The Code in Selected index Change.
protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList ddl = sender as DropDownList;
string BuildingName = ddl.SelectedItem.Text;
Int32 buildid = objbuilding.slect_bid_for_floor(BuildingName);
DataSet dsss = OBJFLOOR.FloorId_Acc_Building(buildid);
// int index = Convert.ToInt32(GridView1.SelectedRow.RowIndex);
//DropDownList ddlg = (DropDownList)(GridView1.SelectedRow.FindControl("DrpFloor"));
// Control gridrow = GridView1.Rows;
GridViewRow rr = GridView1.SelectedRow;
foreach (Control gridrow in GridView1.Rows)
{
DropDownList ddlg = (DropDownList)gridrow.FindControl("DrpFloor");

ddlg.DataSource = dsss.Tables[0];
ddlg.DataTextField = "Floor_Name";
ddlg.DataValueField = "Fid";
ddlg.DataBind();
ddlg.Items.Insert(0, new ListItem("Select", "-1"));
}
// DropDownList ddlg = (DropDownList)(GridView1.FindControl("DrpFloor"));

}

Now My DropDown Is Binded But This Is Binding All The DropDowm.I Have Dyanamic Row Created In Grid View And I Want to Bind Each DropDown INdivisusally Please Let Me Know...There Are So Many Gr8 Programmer Doesn't Any one know Sol....