How all objects of two forms relate in C #

Hello 1- I have two forms called Form 1 and Form 3, in Form 3 I have a database called dgrid2 and a text box called txtr.text which in the text box shows the number of rows of the data grid in cellformatting the database code txtr.Text = dgrid1.Rows.Count.ToString (); I wrote and in Form 1 I have a Yax text called txthazf. I want the value of the text box of Form 3 to be displayed in the text box of Form 1. I also want the value of the text box of Form 2 to be in the text box of Form 1 when it opens.
2- How to communicate all objects and text boxes of two forms with each other. I also applied a general property. Please, along with coding, thanks.

txtr.Text = dgrid1.Rows.Count.ToString ();