Only 1 dropdown value in insert

Question

I have values in dropdown like thos

Mango

Orange

Grapes

I try to insert selected value from dropdown to table so when i select mango value is insered but when i select orange then mango is inserted where is i want to insert orange.. also when i select grapes always mango value is inserted this is waht i try

try
         {
             if (Session["Vechilevalue"] != null && !n.tbl_Vec.Any(x => x.Vec_ID == Vec_ID))
             {

                 v.Vec_ID = Vec_ID;
                 {
                     v.Vec_ID = DropDownList1.SelectedValue;
                 }

                 n.tbl_Vec.Add(v).ToString();
                 n.SaveChanges();

             }
             else
             {


             }
             Session["Vechilevalue"] = DropDownList1.SelectedValue;
         }
 catch
{
}

any solution