Pass value on form close

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Hi every
i have two forms in form A i have a button with textbox which open another form with grid view where i add some values and get sum of these values in textbox i need to back textbox sum in form B to textbox In form A ?? how it can be done ? i use c# .
i try apiece of code but i receive this value in form A

What I have tried:

this.ReturnValue1 = txttotal.Text;
// this.ReturnValue2 = DateTime.Now.ToString(); //example
this.DialogResult = DialogResult.OK;
this.Close();

Posted 26-Sep-16 23:27pm

MR.alaa

Updated 31-Jan-23 1:42am

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3 solutions

Solution 1

Yes - there are a couple of ways, depending on when you want it passed back.
If you use ShowDialog to display the second form, then add a property to the form and read it back after the form has closed.
If you want to update the "main" form without closing the child, use an event: Transferring information between two forms, Part 2: Child to Parent[^]

Posted 26-Sep-16 23:41pm

OriginalGriff

Comments

MR.alaa 27-Sep-16 6:04am

it doesn't work with me !! because i have data which i pass it to form 2 and i need to receive a new different data superpose it need in event form close and then pass the values to the first form i declare public variable but how can refresh the form on the child close with the new data ??

OriginalGriff 27-Sep-16 6:16am

Don't declare public variables! Bad idea...
How are you showing the new form? Are you calling Show or ShowDialog?

Solution 3

in each text change the form opens multiple times. how to avoid this?

Posted 31-Jan-23 1:42am

Haseena P 2022

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Richard Deeming 31-Jan-23 8:17am

Your question is not a "solution" to someone else's question.

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Karthik_Mahalingam · Accepted Answer · 2016-09-26T23:52:00

Solution 2

try this, refer in line comments

Form2

C#

public partial class Form2 : Form
  {
      public string SumValue { get; set; } // create a property in form 2
      private void textBox1_TextChanged(object sender, EventArgs e) // use TextChanged event from properties window
      {
          SumValue = textBox1.Text;
      }

Form1

C#

public partial class Form1 : Form
   {
       private void button1_Click(object sender, EventArgs e)
       {
           Form2 objForm2 = new Form2();
           objForm2.ShowDialog();
           this.textBox1.Text = objForm2.SumValue; // read the value from form2

       }

Posted 26-Sep-16 23:52pm

Karthik_Mahalingam

Comments

MR.alaa 27-Sep-16 6:17am

in form 1 which button click nothing to click it should receive sumvalue of form2 on form2 closing or as form 1 refresh

Karthik_Mahalingam 27-Sep-16 6:38am

ok wait, i willupdate the solution.

MR.alaa 27-Sep-16 6:44am

okay

Karthik_Mahalingam 27-Sep-16 6:57am

try this

private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{

foreach (Form f in Application.OpenForms)
{
if (f.Name == "Form1")
{
(f as Form1).textBox1.Text = this.textBox1.Text;
}
}

}

note: make the textbox in form1 as public modifier

MR.alaa 27-Sep-16 7:33am

Thanks worked successfully

Karthik_Mahalingam 27-Sep-16 7:42am

welcome Alaa

MR.alaa 27-Sep-16 7:44am

you always helpful many thanks for you Karthik Bangalore

Karthik_Mahalingam 27-Sep-16 7:47am

:)