A single value how to carry forward one form to another form in Windows app

Hi

here i am using tab control in windows forms in c#

in this one form text box value  carry to another window form 

i am write like this  but i am getting error

Let us Say you have Two Forms. One is frm1 and the next one is frm2. You want to read textbox1 value from frm2 to frm1.

Declare a public string variable in frm2. On form closing event of frm2, store the public variable with the textbox1.text value. Call the frm2 from frm1. After frm2 is closed, you can use frm2.

(Or) The ugly way:
Make your textbox1 declarion to the public section, then refer the textbox1 like frm2.textbox1.text

Hope this helps