protected void Page_Load(object sender, EventArgs e) { int centerId = Convert.ToInt32(Session["id"]); if (!IsPostBack) { doctorDropDownList.DataSource = aDoctorManager.GetAll(centerId); doctorDropDownList.DataTextField = "Name"; doctorDropDownList.DataValueField = "Id"; doctorDropDownList.DataBind(); diseaseDropDownList.DataSource = aDiseaseManager.GetAll(); diseaseDropDownList.DataTextField = "Name"; diseaseDropDownList.DataValueField = "Id"; diseaseDropDownList.DataBind(); medicineDropDownList.DataSource = aMedicineManager.GetAllMedicine(); medicineDropDownList.DataTextField = "Name"; medicineDropDownList.DataValueField = "Id"; medicineDropDownList.DataBind(); doseDropDownList.DataSource = aDoseManager.GetAll(); doseDropDownList.DataTextField = "Time"; doseDropDownList.DataValueField = "Id"; doseDropDownList.DataBind(); } }