response.redirect not working

Hi,

string path = Request.Url.AbsoluteUri+ "?1=1&Templateid=" + strddlProjTemplate + "&cId=" + ddlClientId.SelectedValue + "&expId=" + ddlExpErp.SelectedValue + "&pid=" + ddlProjDetailId.SelectedValue.Substring(1) + "&projStatusId=" + i.ToString();

Response.Redirect(path, true);

previously it was working fine, now i am getting runtime exception saying that path is not in correct format. i checked 100 of times with the code which was working fine. both r same. so what is the problem tht its not workin now??