Public tool is not visible in form2

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C#3.0

Hello
Two forms in program ,private textBox1 in Form1 .I need the value of that
textBox1 in Form2. I do not want to set variable as Public static string in Form1 equal to textBox1.Text,looking for better solution

What I have tried:

//in Form1 textBox1 declared as Public 
//in Form2
string str;
str=Form1.textBox1.Text;