protected void LOGINbtn_Click(object sender, EventArgs e)
 {
     if (txtusrname.Text != string.Empty && txtpass.Text != string.Empty)
     {
         Userbll bll  = new Userbll();
         int     flag = bll.isvalidsignin(txtusrname.Text, txtpass.Text);
         if (flag == 1)
         {
             Session["User"] = txtusrname.Text;
             string uname = Session["User"].ToString();
             bll.calculatepenaltyprice(uname);
             Response.Redirect("al/Home.aspx");
         }
         else if (flag == 0)
         {
             errorlabel.Text    = "Invalid Username or Password";
             errorlabel.Visible = true;
         }
     }
     else
     {
         errorlabel.Text    = "No Field can be Empty ";
         errorlabel.Visible = true;
     }
 }