I want to disable a button from clicking
if(value>120)
 {
  Form3 form3 = new Form3();
  Button.Disable();
  this.close();
 }

Form3 form3 = new Form3();

otherForm.Button.Enabled = false;

var newForm = new Form3();
newForm.Button.Enabled = false;
newForm.Show();

if(value>120)
 {
 Form3 form3 = new Form3();
 form3.Button.Enabled = false;
 this.close();
 }