How to check in form2 if a button on form1 has been clicked

[Lucy]

Sorry I'm not sure how to do that. Can you explain your answer please? Lucy

[Malcolm Smart]

Events and delegates. Either get Form2 to subscribe to Form1.Button's onclick event or capture the onclick event on form1 and tell Form2 it has been clicked using a delegate :- //in form1 public Event Eventhandler OnButton1Click; void form1_buttonClicked( objects sender , EventArgs args) { //handler tied to the actual button click on form 1 //do other stuff //tell any subscribers we've been clicked if (OnButton1Click != null) OnButton1Click( sender , args ); } ///form2 public void MyHandler( object sender , EventArgs args) { ///button on form1 has been clicked } //in ctor or some initialiser of Form2 form1.OnButton1Click += MyHandler;

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[Xmen Real]

set modifiers of your form2`s label to "public" in properties then in button`s click event ,writes these codes

form2 frm = new form2();
frm.label2.Text = textbox1.Text;
frm.Show();
//or ShowDialog

hope it will help...

Becoming Programmer...

[Lucy]

I have tried that but it comes up with this error when you click the button: Additional information: Object reference not set to an instance of an object. I do not understand the other comments people have made as I am still very new to c#. Lucy

[Xmen Real]

i think you are clicking button when your textbox value is null

Becoming Programmer...

[Lucy]

No the error still occurs when the textbox has text in it.

[Xmen Real]

you are doing some mistakes

Becoming Programmer...

[Pete OHanlon]

Yup - one of the first mistakes is making a control public. You really shouldn't make controls public because you have opened up the whole scope of what the control can do to another unrelated instance.

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[Anthony Mushrow]

Another way is like this: Add another Label to your class variables: private System.Windows.Forms.Label Form2Label; Create a method in form one like this: public void getLabel(Label label) { Form2Label = label; } Then, when you click the button in Form1 just add a bit of extra code. Form2Label.Text = this.TextBox.Text; Now when you start Form2, run the method, and pass it the label. Form1.getLabel(this.label); That should work. You'd have to try it out.

[Paras Kaneriya]

Try using this way declare a bool variable in form2 with public accessiblity like public bool clicked; and in the form load event you can check like if (clicked) { //do whatever you want to do when button1 on form1 is clicked } in form1's button1's click event write private void button1_Click(object sender, EventArgs e) { Form2 frm = new Form2(); frm.clicked = true; frm.Show(); }

Paras Kaneriya
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