Exchange of data between forms [C#]

[someone]

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Usually when you close The form The controls on that form deinitializes, it is better to save the data in a public variable(or a private one and access it thru public methods);
private struct MyData{
     public string  textBox1
};
public MyData data = new MyData();
....
data.textBox1 = textBox36.Text;
....
Form1 form = new Form1();
form.ShowDialog();
this.hash_user.Text = form.data.textBox1;

public string data;
....
data= textBox36.Text;
....
Form1 form = new Form1();
form.ShowDialog();
this.hash_user.Text = form.data;