How to pass text box number into int variable using c#

Question

How to bind total in text box :

Ex : 15000 Database tot_amt Fileds Value Bind In Textbox

TextBox Value in Number =15000;

This Value Pass To The Integer Variable

Ex:

         int a=Convert.ToInt32(Textbox.text);

 

But Textbox value are not the pass in a integer variable a.

How can possible to solved this problem .

plz answer this problem.......