在同一解决方案中访问来自其他项目的表单的控件

Question

I want access controls in a form which is in a different project in the same solution.I have designed in a such a way that one solution has different projects in it.

I have tried the following code.

           Form form =  (Form)Application.OpenForms["frm"];
           if (form != null)
           {

             Button cs = (Button)((form.Controls["btn"]);
               cs.Enabled = false;
           }

Using this code am able to locate the form,but am not able to access controls from it."cs" is returning null value and throwing "null refernce exception error".What could be the possible error and how should I modify the code.Its a windows application using c# visual studio 2010. Any suggestion would be of great help. Thanks

Answer 1

Ignoring why you might want to do this in the first place, I would recommend:

1. Add the first project as a reference to the second
2. Add a public property to the form you need to access to controls from
3. Get the form as you currently are
4. Cast the form to its appropriate/actual type
5. Use the public property.