title: passing data from form2 into form1 and save it in a string variable
body: <p>Im passing data from a textBox from Form2 into Form1 via a second constructor.</p>
  
  <p>After that, I want to set the textbox value from Form2 into a global string variable in Form1. </p>
  
  <p>If I do this, the global variable gets the value I want but not that long. After I close the Form2 Dialog (<code>this.Close()</code> after code has proceeded) the main-constructor executes one more time and I am losing the value for my global string variable...</p>
  
  <p>I have an workaround where I save the textbox value into an textfile and read it if I want the value in it, but that´s not the solution Im looking for.</p>