private void ChangePassword(HttpContext context)
{
int U_ID = Convert.ToInt32(context.Request["U_ID"]);
string oldPassword = context.Request["oldPassword"];
string NewPassword = context.Request["NewPassword"];
BLL.UserInfo bll = new BLL.UserInfo();
context.Response.Write(bll.ChangePassword(U_ID, oldPassword, NewPassword));
}