1.on First Page Set Company in session Varible like session("Company") ="TCS".
2.Second Page load Set EmpId in Session like Session("EmpId") = "001"
3.On Save Button First Set EmpCode In Local Varible and after that use that varible to save empId.
string EmpCode = Session("Company").ToString() + "/" + Session("EmpId").ToString() + "/" + txtcity.SelectedValue