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c# I need one form to populate a text in another

pdering
pdering asked
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When I click on a button on Form1 I need it to populate a textbox in Form2.  How can I do this?
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anarki_jimbelSenior Developer
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Commented:
For that you need to have a reference from one form to another. Are these form parent - child forms? Please explain the scenario.
Senior Developer
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Commented:
OK, I have put a simple project for you:

Two forms.
Form1 has
 - a label, (label1)
 - a button to display a child Form2, (btnShowForm2)
 - a button to display a message on a child form (btnShowMsgOnChild)

Form 2 has:
 - a button to show messages on a parent (ShowMsgOnParent)
 - a label (label1)

See the code below. It has comments, hope this will help:

    public partial class Form1 : Form
    {
        // reference to a child form
        private Form2 childForm = null;
        public Form1()
        {
            InitializeComponent();
        }

        private void btnShowForm2_Click(object sender, EventArgs e)
        {
            // create child and show
            childForm = new Form2(this);
            btnShowForm2.Enabled = false;
            childForm.Show();
        }

        private void btnShowMsgOnChild_Click(object sender, EventArgs e)
        {
            // we send this message from parent; you may read it from textbox, e.g.
            childForm.ShowMessageFromParent("Hello from parent form");
        }

        // this method is invoked by a child form
        public void ShowMessageFromChild(string s)
        {
            this.label1.Text = s;
        }
    }

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    public partial class Form2 : Form
    {
        Form1 parentForm = null;// reference to parent form


        // See, this is NOT a standard default constructur!
        public Form2(Form1 parentForm)
        {
            InitializeComponent();
            this.parentForm = parentForm;// set reference to parent form
        }

        private void ShowMsgOnParent_Click(object sender, EventArgs e)
        {
            // show message on parent; instead of hardcoding you may read it from textbox
            parentForm.ShowMessageFromChild("this is a message from child form");
        }

        // this method is invoked by a parent form
        public void ShowMessageFromParent(string msg)
        {
            this.label1.Text = msg;
        }
    }

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Most Valuable Expert 2011
Top Expert 2015

Commented:
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Commented:
The following will do that for you, it passes the parameter to the form and adds it to the text box.

This would be your code in your first form:


    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
      
        private void btnButton_Click(object sender, EventArgs e)
        {
           Form2 mySecondForm = new Form2("Whatever your data is");
         mySecondForm.ShowDialog();
        }
   }


---

And this is the code for the second form:


    public partial class Form2 : Form
    {
        public Form2(string myData)
        {
            InitializeComponent();
          
        }

      private void frmMain_Load(object sender, EventArgs e)
        {
            txtMyTextBox.Text = myData;
      }
   }
anarki_jimbelSenior Developer
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Commented:
Wow!

Passing text information through constructor... I suspect this approach is not flexible...
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Commented:
Just a different way of going about the OPs question.  And it's flexability is based on what exactly the OP wants to actually achieve.
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Most Valuable Expert 2011
Top Expert 2015

Commented:
Should I take that as my article was too long?   : \

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