I need to populate dropdown from sqlserver which have onSelected property and databind

This is runtime image for my rendered web page I have inserted data in my sql server database, now I am trying to update those records so that changes can be made but when I populate textboxes using datatable functions its working fine but it does not populate selected "Program, Group and Class dropdownlists" from selected database value or selecteditems.

protected void campus_SelectedIndexChanged(object sender, EventArgs e)
                {
                    program.DataSource = dm.getData("SELECT DISTINCT cpCampusCode, cpCamName, cpProgramCode, cpProgName  From   CampusPrograms Where cpCampusCode = '" + campus.SelectedValue + "'");
                    program.DataTextField = "cpProgName";
                    program.DataValueField = "cpProgramCode";
                    program.DataBind();
                    program.Items.Insert(0, new ListItem("Select Program", "0"));



                }

         protected void program_SelectedIndexChanged(object sender, EventArgs e)
                {
                    Group.DataSource = dm.getData("Select DISTINCT a.ProgramCode, a.ProgramName, a.GroupCode AS GroupCode, a.GroupName AS GroupName from ProgramGroup a Inner Join CampusPrograms b ON b.cpProgramCode=a.ProgramCode Where b.cpProgramCode =  '" + program.SelectedValue + "' Order by GroupName ASC");
                    Group.DataTextField = "GroupName";
                    Group.DataValueField = "GroupCode";
                    Group.DataBind();
                    Group.Items.Insert(0, new ListItem("Select Group", "0"));
                }


         protected void stdid_SelectedIndexChanged(object sender, EventArgs e)
                {
                    Button1.Enabled = false;
                    UpdtBtn.Enabled = true;
                    DataTable dt = dm.getData("select * from StudentInquiry si inner join CampusPrograms a on si.iProgramCode=a.cpProgramCode  Where si.inqID='" + stdid.SelectedValue + "'");
                    foreach (DataRow dr in dt.Rows)
                    {
                        doi.Text = "" + dr["iDateOfInquiry"];
                        campus.SelectedValue = "" + dr["iCamCode"];
                        program.SelectedValue = "" + dr["iProgramCode"];
                        Group.SelectedValue = "" + dr["iGroupCode"];
                        Class.SelectedItem.Text = "" + dr["iClassCode"];


                        stName.Text = "" + dr["iStName"];
                        stCnic.Text = "" + dr["iCnic"];
                        dob.Text = "" + dr["iDOB"];
                        birthCity.SelectedItem.Text = "" + dr["iPlaceOfBirth"];
                        sphone.Text = "" + dr["iPhoneNo"];
                        smobile.Text = "" + dr["iMobileNo"];
                        semail.Text = "" + dr["iEmailID"];
                        saddress.Text = "" + dr["iAddress"];
                        gender.SelectedItem.Text = "" + dr["iGender"];
                        Religion.SelectedItem.Text = "" + dr["iReligion"];
                        DropDownList2.SelectedItem.Text = "" + dr["iMaritalStatus"];
                        Countries.SelectedItem.Text = "" + dr["iNationality"];
                        ffname.Text = "" + dr["iFFName"];
                        flname.Text = "" + dr["iFLName"];
                        fmob.Text = "" + dr["iFMobile"];
                        fnic.Text = "" + dr["iFCnic"];
                        qua.SelectedItem.Text = "" + dr["iLastQualification"];
                        lastins.Text = "" + dr["iLastInstitute"];
                        pyear.SelectedItem.Text = "" + dr["iPassingYear"];
                        Grade.Text = "" + dr["iGrade"];
                        RadioButtonList1.SelectedValue = "" + dr["iSource"];
                        remarks.Text = "" + dr["iRemarks"];
                    }

                }