dynamic create text box value insert into database c#

hi frnd i have a problem:

first i select drop down list value like 1 then create 2 text box

i select drop down list value like 2 then create 4 text box

suppose select 1 then create 2 text box and in which insert value like

first- director name

second - Din

if i select 2 then create 4 text box but insert same:

first row two text box - director name1 and mobile number1

Second row two text box - director name2 and mobile number2

but insert single column like

foreach{

objadmin.director=txt.text;

objadmin.din=txt.text;

}