prevent postback of HtmlButton in C#

Question

I am creating HtmlButton dynamically in .cs file. Adding it to Panel using

HtmlButton b1 = new HtmlButton();
b1.Attribute.Add(\"onclick\",\"javascript:valid         


        

Answer 1

b1.Attribute.Add("onclick","return validateNclick(this.id);");

function validateNclick(id){
//...
if(condition){
   return true
}
else{
  return false;
}
}