protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
 {
     DropDownList2.Items.Clear();
     Doctor_GetDoctorByDepartmentBL objDoctor_GetDoctorByDepartmentBL = new Doctor_GetDoctorByDepartmentBL();
     DropDownList2.DataSource = objDoctor_GetDoctorByDepartmentBL.Doctor_GetDoctorByDepartment(Convert.ToInt32(DropDownList1.SelectedValue), Convert.ToInt32(Session["doctorId"].ToString()));
     DropDownList2.DataValueField = "ID";
     DropDownList2.DataTextField = "DOCTOR_NAME";
     DropDownList2.Items.Add(new ListItem("--Select--", "0"));
     DropDownList2.DataBind();
 }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        DropDownList2.Items.Clear();
        Doctor_GetDoctorByDepartmentBL objDoctor_GetDoctorByDepartmentBL = new Doctor_GetDoctorByDepartmentBL();

        DropDownList2.DataSource     = objDoctor_GetDoctorByDepartmentBL.Doctor_GetDoctorByDepartment(Convert.ToInt32(DropDownList1.SelectedValue), Convert.ToInt32(Session["doctorId"].ToString()));
        DropDownList2.DataValueField = "ID";
        DropDownList2.DataTextField  = "DOCTOR_NAME";
        DropDownList2.Items.Add(new ListItem("--Select--", "0"));
        DropDownList2.DataBind();
    }