Grade

protected void Button1_Click(object sender, EventArgs e)

        {

            if (int.Parse(txtphy.Text) < 35 || int.Parse(txtphy.Text) < 35 || int.Parse(txtChe.Text) < 35)

            {

                Response.Write("Fail");

            }

            else

            {

                txtTot.Text = Convert.ToString((int.Parse(txtphy.Text) + int.Parse(txtMaths.Text) + int.Parse(txtChe.Text)));

                txtper.Text = Convert.ToString(int.Parse(txtTot.Text) / 3);

                if (int.Parse(txtper.Text) == 35 && int.Parse(txtper.Text) >= 49)

                {

                    Response.Write("Your Grad Id C");

                }

                else

                    if (int.Parse(txtper.Text) > 49 && int.Parse(txtper.Text) <= 59) { Response.Write("Your Grad Id B"); }

                    else

                        if (int.Parse(txtper.Text) >= 60 && int.Parse(txtper.Text) <= 65) { Response.Write("Your Grad Id A"); }

                        else

                            if (int.Parse(txtper.Text) > 65 && int.Parse(txtper.Text) <= 75) { Response.Write("Your Grad Id A+"); }

             }

        }

 ---------------------------------------------

  <script type="text/javascript" language="javascript">

    function checkValidateData()

    {

    var che =document.getElementById("txtChe.Text");

    var phy=document.getElementById("txtPhy.Text");

    var math=document.getElementById("txtMath.Text");

 

//    if(isNaN(che))

//    {

//    alert('Please Enter Marks');

//    return true;

//    }

    

var uid;

var temp=document.getElementById("<%=txtChe.ClientID %>");

uid=temp.value;

if(uid=="")

{

alert ('Please Enter UserName');

return false;

}

   

   

    }

    </script>