How can i see a combo in al window forms in c#

Hy. I want to use the combo selected item from form1 in form 2 and 开发者_C百科i don't know how in c#.

Please help!

• When opening Form2, pass the object containing Form1 as a reference.
• In Form2, access the combo box using this object either
  • directly (note that this might require changing the access modifier of the combo box from protected to public) or
  • (more elegantly) by calling a public method of Form1 written by you that returns the selected item of the combo box.

Not a good idea to pass a reference in form 2's constructor. Suppose the following code is in Form1.cs.

Form2 f = new Form2();
f.Tag = myCombo;
f.showDialog();

You can operate the combo in Form2 by getting the tag and parse it to ComboBox. A better way:

Form2 f = new Form2();
Dictionary<string,object> controlsInForm1 = new Dictionary<string,object>();
controlsInForm1.Add("combo",myCombo);
controlsInForm1.Add("label",myLabel);
f.Tag = controlsInForm1;
f.showDialog();

Now you can operate controls in Form1 safely without complex constructor of Form2.

pass a reference to the combo box in form 1 to form 2, possible in form 2's constructor.

I'd create a read only public property which returns the selected item.

public object ComboValue
{
    get 
    {
        return combo.SelectedItem;
    }
}

In stead of object, use the proper class/type.