Button Click Events

Question

I was creating a registration form and I have a doubt here:
What is a best practice at the moment of clicking the button register... check all the input text using javascript or a method including at the code behind and being called on click event...it's a silly question but I'm newbie developing applications with ASP.NET

sudharsan s · Answer

this is validation in javascript function validate() { if (document.getElementById( ).value == ===Select Category===) { alert((*)Select Category TO Upload the File); document.getElementById( ).focus(); return false; } if (document.getElementById( ).value == ===Select SubCategory===) { alert((*)Select SubCategory TO Upload the File); document.getElementById( ).focus(); return false; } if (document.getElementById( ).value == ===Select Owner ID===) { alert((*)Select OwnerID TO Upload the File); document.getElementById( ).focus(); return false; } if (document.getElementById( ).value == ) { alert((*)Select Date Upload the File); document.getElementById( ).focus(); return false; } if (document.getElementById( ).value == ) { alert((*) Upload Field should not be blank); document.getElementById( ).focus(); return false; } return true; } Behind Code you should call this event inside of pageload. cmdAdd .Attributes.Add(OnClick return validate (event)); cmdAdd is the id of button. validate is function name which is used in javascript