How to display data in control of combobox by using memory variable in windows application

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.NET3.5

C#

.NET

In my application i have 3 forms . In each form i have two button Next and Back button. The Next button i used to go to next form and back button is used to go to previous form. In next button click event i store data of control in memory varibale and also store data in sql and after that it goes to next form. when i goes to second form and after that i clicked on back button of second form it goes to previous form but data is not display in combobox which i selcted which is come from database.but rest of the control display data. Is there any way to store combox selected data which is come from database in memory varibale. below i mention my code. In combobox i retrive and dsiplay data from database using DisplayMember property of combobox .

 private void btnnext_Click(object sender, EventArgs e)
        {
           try
            {
                using (SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]))
                {
                    using (SqlCommand cmd = new SqlCommand())
                    {
                        conn.Open();
                        cmd.Connection = conn;
                        cmd.CommandType = System.Data.CommandType.StoredProcedure;
                        cmd.Parameters.AddWithValue("@Transtype", "SaveEmployeeSelfDetail");
                        cmd.Parameters.AddWithValue("@Employee_Code", employeecode);
                        cmd.Parameters.AddWithValue("@Salutation", salutaion);
                        cmd.Parameters.AddWithValue("@FirstName", firstname);
                        cmd.Parameters.AddWithValue("@MiddleName", middlename);
                        cmd.Parameters.AddWithValue("@LastName", lastname);
                        cmd.Parameters.AddWithValue("@Gender", gender);
                        cmd.Parameters.AddWithValue("@DateOfBirth", dateofbirth);
                        cmd.Parameters.AddWithValue("@MaritalStatus", martialstatus);
                        cmd.Parameters.AddWithValue("@FatherName", fathername);
                        cmd.Parameters.AddWithValue("@DateOfJoin", dateofjoin);
                        cmd.Parameters.AddWithValue("@EmpOrg1", firstorglevel);
                        cmd.Parameters.AddWithValue("@EmpOrg2", secondorglevel);
                        cmd.Parameters.AddWithValue("@EmpOrg3", thiredorglevel);
                        cmd.Parameters.AddWithValue("@EmpOrg4", fourthorglevel);
                        cmd.Parameters.AddWithValue("@EmpOrg5", fifthorglevel);
                        cmd.Parameters.AddWithValue("@EmpOrg6", sixorgl);
                        cmd.Parameters.AddWithValue("@EmpOrg7", sevenorglevel);
                        cmd.Parameters.AddWithValue("@EmpOrg8", eightorglevel);

                        // cmd.Parameters.AddWithValue("@ToDate", Convert.ToDateTime (dateTimePicker2.Text.Trim()));
                        cmd.CommandText = "Hiring_CreateNewEmployee";

                        SqlDataAdapter dAdapter = new SqlDataAdapter();
                        dAdapter.SelectCommand = cmd;
                        cmd.ExecuteNonQuery();
                        conn.Close();
                                            
                    }
                }

               // MessageBox.Show("Record Saved Successfully", "Self Details", MessageBoxButtons.OK, MessageBoxIcon.Information);



            }
            catch (Exception ex)
            {

                lblerror.Text = ex.Message;
            }


// store data in memory variable
            Data.salutaion = salutaion;
            Data.fathername = txtfathername.Text;
            Data.empid = employeecode;
            Data.firstorglevel = firstorglevel;
            Data.secondorglevel = secondorglevel;
            Data.thiredorglevel = thiredorglevel;
            Data.fourthorglevel = fourthorglevel;
            Data.fifthorglevel = fifthorglevel;
            Data.sixorgl = sixorgl;
            Data.sevenorglevel = sevenorglevel;
            Data.eightorglevel = eightorglevel;
           // Data.singleemployeearea = sixthorglevel;
            //Data.singleemployeearea = comboBox1.SelectedItem.ToString();
            Data.firstname = firstname;
            Data.lastname = lastname;
            Data.middlename = middlename;
           // Data.designation = sevenorglevel;
            Data.martialstatus = martialstatus;
            Data.gender = gender;
            Data.dateofbirth = dateofbirth;
            Data.dateofjoining = dateofjoin;
            //Data.employeetype = eightorglevel;
            Data.dd = datetimejoin.Value;
        }

// calling function on click on back button of 2nd form which display data in control

public void DisplyEmployeeSelfDetails()
       {
           try
           {


               txtemployeecode.Text =      Data.empid;
               cmbFirstOrgLevel.SelectedItem  = Data.firstorglevel;
               cmbSecondOrgLevel.SelectedItem  = Data.secondorglevel;
               cmbThiredOrgLevel.SelectedItem = Data.thiredorglevel;
               cmbFourthOrgLevel.SelectedItem = Data.fourthorglevel;
               cmbFifthOrgLevel.SelectedItem = Data.fifthorglevel;
               cmbsixorglevels.SelectedItem = Data.sixorgl;
               cmbsevenorglevel.SelectedItem = Data.sevenorglevel;
               cmbeightorglevel.SelectedItem = Data.eightorglevel;
               //comboBox1.SelectedItem = Data.singleemployeearea;
               cmbsalutation.SelectedItem = Data.salutaion;
               txtfathername.Text         = Data.fathername;
               txtfirstname.Text          = Data.firstname;
               txtlastname.Text = Data.lastname;
               txtmiddlename.Text = Data.middlename;

               combomaritalstatus.SelectedItem = Data.martialstatus;
               combogender.SelectedItem = Data.gender;
               datetimejoin.Value = Convert.ToDateTime(Data.dateofjoining);
               datetimebirth.Value = Convert.ToDateTime(Data.dateofbirth);


           }
           catch
           {

           }
       }