How to assign a value entered in a textbox to label in another form

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C#

Windows

form

Dear All,

I am sai shyam. Here i just want to know how to assign a value entered in a textbox to label in the next form.

example: I have 3 windows forms 1st page is login page, second page is a gridview and third form is a button located in a gridview when i click a button the form will open.

Now when i enter a name in login page i.e., username it should be reflected in 3rd form.

Could you please help me out. Thank you.

What I have tried:

in button click i wrote session["username"]=txtusername.text;
and in 3rd form under form load i wrote label.text=session["username"];

But getting error as the name session does not exist in the current context.