how to fire event in other form

Article
2010-03-15

Question

_{Monday, March 15, 2010 9:58 AM}

hello every one

i want to fire the button click event from form1 in form2

how can i do this?

i want to do this because i load data the user selects from datagridview in form1 to datagridview in form2

and i want the data to be updated in time just when the user chooses some rows and press the button submit

thank in advance for any replies

All replies (7)

_{Wednesday, March 17, 2010 6:27 PM ✅Answered}

Basically, the proper way to do this is by events.

In Form2 create an event:
public event EventHandler PerformForm1Click;

Then in form2, where you want to perform the click do this:

private void InvokeForm1Example()
{
     EventHandler handler = this.PerformForm1Click;
     if (handler != null)
          handler(this, EventArgs.Empty);
}

//meanwhile in Form1, you would do this:
Form2 frm2 = new Form2();
frm2.PerformForm1Click += new EventHandler(frm2_PerformForm1Click)
frm2.ShowDialog();

//in Form1
private void frm2_PerformForm1Click(object sender, EventArgs e)
{
btn1.PerformClick();
btn2.PerformClick();
}

John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

_{Monday, March 15, 2010 10:07 AM}

You can call Button's PerformClick() method.Miha Markic [MVP C#] http://blog.rthand.com

_{Monday, March 15, 2010 10:08 AM}

Hi,

Here i give small sample Algorithm, May it will help you,

form1
{
     form2 frm2;
     datgridview dt1;
     private void button_click()

     {
           frm2 = new form2();
           object obj = GetdatgridviewValue(dt1);
           frm2.SetDataGridValue(obj);
           this.hide();
           frm2.Show();
      }
}

form2
{
      public void SetDataGridValue(object obj1)
      {
             Assign DataGridview1 value to DataGridview2 value
      }
}

Regards,
S.Subashselvan

_{Monday, March 15, 2010 10:11 AM | 1 vote}

Hi Esso,

I belive you are calling your form 2 from within form 1, therefore the easiest approach i would recommend as long it wouldn't contradict your design principal is as follows,

Assuming you have a button named btnButton1 in Form1 , pass the refference of this button to your Form2 (using the constructor or a property.) and store it as a refference in Form2 . Assuming you have a btnButton2 in Form2 and need to trigger the button in form 1. use the following method.

private void Form2button1_Click(object sender, EventArgs e)
{
    form1Button1.PerformClick();
}

Hope this helps you.

Best Regards,
Praneeth

_{Monday, March 15, 2010 10:19 AM}

hello Praneeth Wickramasinghe,

i see that ur reply is the most appropriate for me, but i'm sorry that i can't code this idea my own.

////////////////////////////////

i don't know how to make this

if u can, please write me the code that i can use to implement this idea

thank again for ur reply

_{Monday, March 15, 2010 10:36 AM}

He Esso,

This will be what you are required to do.

Form1 code:

Assume you already have a button named btnShowForm2 winch will call Form2.
Assume you already have a button named btnSave in this form that performs the action you require when the button in form 2 (btnClickForm1Button) is clicked.

Form1
{
   // This button will invoke Form 2 and display it.
   private void btnShowForm2_Clic(object sender, EventArgs e)
   {
        Form2 form2 = new Form2(btnSave);
        form2.Show();
   }
   
   // This is the even that will fire when you click on the Form2 button
   btnSave_Click(object sender, EventArgs e)
   {
        MessageBox.Show("Data Saved");
   }
}

Form2 code:

Assume you have a button named btnClickForm1Button in this form

Form2
{
   Button btnForm1Button;

   //Form2 constructor
   public Form2(Button form1Button)
   {
        InitializeComponent();
        this.btnForm1Button = form1Button;
   }
   // This is the even that will fire the button event in Form1.
   btnClickForm1Button _Click(object sender, EventArgs e)
   {
        btnForm1Button.PerformClick();
   }
}

Hope this helps you,

Best Regards,
Praneeth

_{Wednesday, March 17, 2010 5:38 PM}

Hi Praneeth,

i want to tell you about another method to fire event from one form to another

i have made this in form2

Form2 Code :

public PreDefinedDatabase()

{

InitializeComponent();

}

public void button1_Form2_Click(object sender, EventArgs e)

{

// code

}

and in form 1 :

PreDefinedDatabase f = new PreDefinedDatabase();

f.button1_Click(f, e);

it worked with me properly, but the question is will this method affect the application any way? thank you for your interest Esso

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