从前台页面取参数

//从前台页面取参数
parameter =new SqlParameter[] { DCommon.SqlHelper.MakeInParam("UserName", SqlDbType.NVarChar, 200, this.searchkey.text.Trim()) };
                   if(DCommon.SqlHelper.ExecuteScalar("select UserName from bbs_user where UserName = @UserName",parameter) != null)