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  string userName = Request.QueryString["userName"].ToString();
  AccountsInfo acc= AccountsInfoManager.getAccountsInfoByeRegAccounts(userName);
//ÓöÔÏó½ÓÊÕµÄ.
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 $.ajax({
  type:"GET",
  url:"Default2.aspx",
  dataType:"html",
  data:"userName="+$("#txtName").val()});
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C# code:

if(acc != null) //¸ù¾ÝÄã×Ô¼ºµÄÅжÏÒÀ¾ÝÐÞ¸Ä
{
Response.Write("true");
}
else
{
Response.Write("false");
}



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JScript code:

$.ajax({
type : "post",
url : "Default.aspx",
data : "userName="+$("#txtName").val(),


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