How to call a function in form1 from form2 ?

Question

4.00/5 (1 vote)

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Hello,
I have a problem while i am self learning C#. Here it is.
On a windows form application i have 2 froms(Form1 and Form2) . I show the Form2 to open an Excel file and read some data and then upon clicking "ok" on Form2 i need to execute a function on form1 and form2 can be closed(Of course i do this by this.close()).
Kindly let me know how i can call functions in form1 from form2.
I need to do this because form1 has data which needs to be worked upon.

Posted 29-May-11 21:16pm

asjadazeez

Updated 25-Jul-21 11:41am

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Comments

Steven.Pinto2000 30-May-11 3:23am

Can you show a demo code ?

6 solutions

Solution 5

This is a popular question about form collaboration. The most robust way is implementation of appropriate interface by the form class.

For more details, please see my past answer:
How to copy all the items between listboxes in two forms[^]. See also other suggestions and discussion.

—SA

Posted 29-May-11 21:41pm

Sergey Alexandrovich Kryukov

Solution 6

Hello,

You can also use delegate:

In Form2:

MIDL

public delegate void methodHandler();
public methodHandler OnRunMethod;

In OK Click event:

C#

if (OnRunMethod != null)
    OnRunMethod();

example:

C#

private void OK_Click(object sender, RoutedEventArgs e)
{
    if (OnRunMethod != null)
        OnRunMethod();
}

In Form1 (where you open Form2):

Form2 form2 = new Form2();
form2.OnRunMethod += new methodHandler(MyMethod);
form2.Show() // or ShowDialog()

and in Form1:

C#

private void MyMethod()
{
    //Do somethings
}

I think it's a perfect way because it can be called from Form2 and you can use both of Show() or ShowDialog().

Good luck.

Posted 29-May-11 22:53pm

Shahin Khorshidnia

Updated 29-May-11 22:57pm

v2

Solution 3

Make this method public and pass a reference to Form1 to Form2 constructor (custom ShowDialog method/whatever). Calling one form methods from another is not good practice, though. If possible, move it to another place (mediator class, static class or something)

Posted 29-May-11 21:23pm

Timberbird

Solution 4

Pass a reference of Form1 into Form2.
Once you need to call Form1, simply call the appropriate Form method (a public method) and then just close Form2.

Posted 29-May-11 21:27pm

Abhinav S

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Prerak Patel · Accepted Answer · 2011-05-29T21:21:00

Solution 1

On Form1's event where you open Form2, follow this -

1. Create object for form
Form2 f = new Form2();
2. Use f.ShowDialog() to open the form
3. Do what you do in form2
4. Code the other stuff after f.ShowDialog() which would run after form2 is closed.

Posted 29-May-11 21:21pm

Prerak Patel

Comments

asjadazeez 30-May-11 3:28am

Nice and simple solution. I just overlooked "showdialog" Thanks man !

Prerak Patel 30-May-11 4:11am

You are welcome.

Shahin Khorshidnia 30-May-11 4:54am

+5It works.

JustWorking · Accepted Answer · 2011-05-29T21:22:00

Solution 2

form1 Test= new form1()
Test.FUNCTIONNAME()
this.close()

Posted 29-May-11 21:22pm

JustWorking

Updated 29-May-11 21:24pm

v3

Comments

asjadazeez 30-May-11 3:30am

Thanks got it.

JustWorking 30-May-11 8:17am

Remember to 5 :)