在不重新打开表单的情况下从另一表单调用一种表单的事件/方法

Question

'Form1' and 'form2' are open in mdi. when i press button in 'form1' it should call evevt or methods of 'form2', eg like 'checkbox' checked ,refresh grid for that I have code for form2(child form):

public partial class Form2: Form
{
    private Form1 Form1_Obj1;
    public Form2(Form1 Form1_Obj2)
    {
        InitializeComponent();
        Form1_Obj1 = Form1_Obj2;
    }
    public Form2()
    {
        InitializeComponent();

    }

for calling events from form1 I have code

Form2 obj=new Form2(this);
obj1.chkSortPlace.Checked = true;
              or         
obj1.chkSortPlace_CheckedChanged(null, null);

problem is event is call but code in event ieassign datasource to gridview is not occur.it will not give error but result is not display grid not refresh

Answer 1

A trick to call a method of some other forms in c#.Net is to use Application.OpenForms here is a sample code

    foreach (Form frm in Application.OpenForms)  
            {  
                if (frm is Form2)
                 {
                     //Put your code here.
                 } 
            }  

Answer 2

Edit: changed the answer because I misunderstood what OP was trying to do.

The reason you are unable to manipulate chkSortPlace is because by default all controls that you add to a form are marked as private .

Go to Form1, right click on it, select "View Code" and add the following:

public bool SortPlaceChecked 
{
    get { return chkSortPlace.Checked; }
    set { chkSortPlace.Checked = value; }
}

Then, when you want to change the state of chkSortPlace from your other form, simply use the public property you added above.