how to store values in session from dynamic created textbox

i have a web form in which i created multiple textboxes base on user requirement

 




 
             
Code:

runat="server" ID="txtCode">
Fine:
runat="server" ID="txtFine">
 
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there may be 2 or three rows with 4 or 6 textboxes,
i want to store these values in session ,and then call session in code behind ,and insert into database using for loop??does there is any solution?