1.Web.config file ,
Supra Skytop II Shoes  tag added : 
  
 <add verb = POST, GET : 
 Ajax.Utility.RegisterTypeForAjax (typeof (Register)); 
 
 3.Sql.cs class has a means CheckID (name), check whether the name already exists in the database ; 
 
 4.Register.aspx code-behind document in a way : 
 [Ajax.AjaxMethod] 
 public string CheckName (string name) 
 {
 Sql sql = fashionable Sql ( ); 
 return sql.CheckID (label); 
} 
 
 5.Register.aspx to join the HTML script children : 
  
 
 6.Register.aspx page in a txt carton txtName, an HTML button btnCheck, 
 properties of the btnCheck oncleck merit defined in tread 4 to fill the function Check (); 
 
 only so tiny ... I will also use this step is probably no agreeable .. of kid . 
 made here for likewise available because your reference .. I forgot to look at when ..- - | 
 
 Note : Register.aspx is your own login page . 
 Sql.cs is the data control floor .