Passing strings between windows forms

hi there, im having trouble trying to pass strings between my windows forms...

i have 2 simple forms, the first has a textbox and a button on it, and the second has a label on it. When the user inputs something into the textbox on the first form and presses the button i would like the text in this textbox to be passed to the 2nd form and be displayed as the label text.

Any help is much appreciated.