asp.net中检查用户是否过期的代码

SqlParameter[] parms ={

db.MakeInParam("@name",SqlDbType.VarChar,50,name),

db.MakeInParam("@pass",SqlDbType.VarChar,50,pass),

};
StringBuilder sbf = new StringBuilder();

sbf.Append(" select datediff(day,(select datetime from UserInfo where ID=1),getdate()) as day from UserInfo ");

sbf.Append(" where name=@name");

sbf.Append(" and pass=@pass");

DataSet ds= db.RunProcReturn(sbf, parms,"User");

int i =Int32.Parse( ds.Tables[0].Rows[0]["day"].ToString()) ;

if (i > 0)

{

return true;

}

else

{

return false;

}