Gridview selected index changed

Question

when i selecting row from gridview and data getting loading into textbox and dropdownlist,when data get load in dropdown list value getting double to display ....

 

 

protected void GVCon_SelectedIndexChanged(object sender, EventArgs e)
 {
     cno.Text = GVCon.SelectedRow.Cells[1].Text;
     txtcontainer.Text = GVCon.SelectedRow.Cells[2].Text;
     txtWeight.Text = GVCon.SelectedRow.Cells[3].Text;
     txtbaletotal.Text = GVCon.SelectedRow.Cells[5].Text;
     //string SesnId = dm.GetData("select Cat_ID from dbo.ConCatagory where Cat_Name='" + GVCon.SelectedRow.Cells[6].Text.Trim() + "'").Rows[0][0].ToString();
     //DDLCAT.SelectedValue = SesnId;

     DDLCAT.SelectedItem.Text = GVCon.SelectedRow.Cells[6].Text;

 

DDLCat.selecteditem.text = GVcon.selectedRow.cells[6].Text;

here is screen shot... Goodwill getting double display ....