when use Asp.net net Url ReWriting Ajax WebMethod wont Called

Hi,m getting url like 

http://localhost:10869/Customer

$.ajax({
type: "POST",
contentType: "application/json",
data: "{'Type':'" + type + "'}",
url: "CustomerMaster.aspx/getSelectList",//when m using Asp.Net Url Re-writing WebMethod wont called
dataType: "json",
success: function (data) {

}
}); 

webMethod

public static string(string Type)

{

return "";

}

Thank You